Can Mutual Wills Be Changed? (w/Examples) + FAQs

Yes, mutual wills can be changed, but only under strict conditions that depend on when the change happens and whether a binding contract exists between the two will makers. During the joint lifetime of both testators, either party can revoke or amend a mutual will, as long as they give proper notice to the other party. After one testator dies, the surviving testator is usually bound by the mutual-wills agreement, and courts will step in through a constructive trust remedy to protect the intended beneficiaries.

The core legal problem is the clash between two basic rules. The first rule is that wills are always revocable during the testator’s lifetime, a principle embedded in the Uniform Probate Code Section 2-507. The second rule is that contracts to make or not revoke a will are enforceable, a principle codified in UPC Section 2-514 and state statutes like California Probate Code §21700. When those rules collide, the surviving spouse often tries to rewrite the estate plan, and disinherited beneficiaries sue to enforce the original deal.

According to the American Bar Association’s 2024 estate planning survey, roughly 68% of blended-family estate disputes involve some form of allegation that a mutual or contractual will was improperly revoked. That statistic shows why this topic matters so much to couples with children from prior relationships.

Here is what you will learn in this article:

• ⚖️ How federal doctrine and state statutes decide when a mutual will becomes binding
• 🏠 The difference between joint, mirror, and mutual wills, and why that difference changes everything
• 📜 The exact steps to properly revoke or amend a mutual will before the first death
• 👪 How courts protect disinherited children through constructive trusts after the first death
• 🚫 The seven most common mistakes that void a mutual-wills agreement or trigger costly litigation

What Is a Mutual Will?

A mutual will is a will made by two people, usually spouses, who agree in writing that neither will change the terms without the other’s consent. The agreement turns two ordinary wills into a binding contract, and that contract survives the death of the first party. Courts treat the surviving party as a trustee of the promised assets, which means the survivor cannot simply rewrite the estate plan after the funeral.

The doctrine traces back to the English case Dufour v. Pereira (1769), where Lord Camden ruled that a surviving spouse who accepts benefits under a mutual will cannot later disappoint the agreed beneficiaries. American courts adopted the rule, and today it lives in the Restatement (Third) of Property: Wills and Other Donative Transfers §4.1. The rule protects reliance interests, because the first spouse to die gives up the chance to change plans based on the survivor’s promise.

A common misconception is that every married couple with similar wills has mutual wills. That belief is wrong, and it causes expensive litigation. Without a clear written agreement not to revoke, courts treat matching wills as mere mirror wills, which both parties can change freely at any time.

Mutual vs. Mirror vs. Joint Wills

The three types of couple-based wills look similar on paper, but they behave in very different ways once one spouse dies. Understanding the distinction is the first step in deciding whether a change is allowed. Each type carries its own revocation rules, probate procedure, and tax consequences under the Internal Revenue Code §2056 marital deduction.

A mirror will is simply two separate wills with matching terms, and either spouse can revoke at will. A joint will is a single document signed by both spouses, which probate courts dislike because it must be probated twice. A mutual will adds a binding contract layer on top of either structure, and that contract is what creates the enforceable promise.

The consequence of confusing these categories is severe. If a client intended a mutual will but the attorney drafted only mirror wills, the surviving spouse can disinherit the stepchildren with no legal recourse. The real-world example is Olive v. Biggs, 276 N.C. 445 (1970), where the North Carolina Supreme Court found a binding contract despite sloppy drafting, but only after years of litigation.

Will Type	Can It Be Changed After First Death?
Mirror Will	Yes, freely and without notice
Joint Will	Usually no, if contractual intent is clear
Mutual Will	No, unless all beneficiaries consent

The Governing Law Framework

Federal law does not directly control will revocation, because probate is a state matter under the Tenth Amendment. However, federal tax law heavily influences drafting choices through the federal estate tax exemption, which sits at $13.99 million per individual for deaths in 2025 and adjusts yearly for inflation. Drafters must balance the binding nature of mutual wills against the portability election under IRC §2010(c)(5).

State law supplies the actual rule for when a mutual will becomes irrevocable. The majority rule, adopted in UPC §2-514, requires clear and convincing evidence of a contract, either in the will itself, in a separate signed writing, or by express reference. A minority of states, like Texas Estates Code §254.004, require the contract to appear on the face of the will.

The consequence of ignoring the state-specific evidentiary rule is total failure of the mutual-wills claim. In California Probate Code §21700, for example, oral promises are not enough, and even a handshake between loving spouses will not bind the survivor.

Can Mutual Wills Be Changed Before the First Death?

Yes, either spouse can change or revoke a mutual will while both are still alive, but only if they follow the notice rules spelled out in the contract or implied by law. The right to revoke during joint lifetime is a default rule, and it exists because forcing a living person to keep an unwanted will would violate the basic principle of testamentary freedom. Courts protect this freedom because circumstances change, and a rigid no-revocation rule would trap people in outdated estate plans.

The key requirement is notice. The revoking spouse must tell the other spouse, in writing, that the mutual-wills agreement is terminated. The notice gives the other spouse a chance to also change their will, which is fair because the original agreement was a two-way promise. Without notice, some courts, like the Kansas Supreme Court in In re Estate of Chronister, 203 P.3d 1267 (2009), treat the secret revocation as a breach of contract that survives into probate.

A common misconception is that getting a divorce automatically revokes a mutual will. That belief is partly true, because UPC §2-804 revokes provisions in favor of a former spouse, but it does not erase the contractual promise to third-party beneficiaries like stepchildren. The consequence is that a divorced spouse may still be bound to leave property to the ex-spouse’s children.

Proper Revocation Methods

Every state recognizes three core ways to revoke a will, and mutual wills follow the same rules during joint lifetime. The first method is physical destruction, such as tearing, burning, or canceling the original document with revocatory intent, as described in UPC §2-507(a)(2). The second method is executing a new will that expressly revokes the old one. The third method is executing a written revocation with the same formalities required for a will.

Each method has traps. Physical destruction of a mutual will does not erase the underlying contract, so the destroyed document can still support a constructive-trust claim. A new will that only partially conflicts with the old one creates interpretation fights, and the doctrine of dependent relative revocation may resurrect the old will if the new one fails.

The real-world example involves Maria Gonzales, a widow in Phoenix who tore up her mutual will after a fight with her stepson. She died before signing a replacement, and the Arizona probate court used dependent relative revocation to enforce the torn document, because the evidence showed she only wanted to revoke if the new will took effect. The consequence was that the stepson inherited despite the dramatic tearing.

Required Notice to the Other Spouse

Notice is the linchpin of lifetime revocation, and skipping it converts a permissible change into a breach of contract. The Restatement (Third) of Property §4.1 comment c requires reasonable notice so the non-revoking spouse can adjust their own estate plan. Most courts hold that written notice delivered to the other spouse’s last known address satisfies the duty.

The consequence of secret revocation is often a damages claim or a constructive trust against the revoker’s estate. In Junot v. Estate of Gilliam, 759 S.W.2d 654 (Tenn. 1988), the Tennessee Supreme Court held that a secret mid-life revocation by one spouse, hidden until death, still breached the contract and entitled the other spouse’s heirs to damages.

A real-world example involves Thomas O’Brien, a retired teacher in Boston, who signed a new will without telling his wife. She discovered the change only after his death, and the Massachusetts probate court enforced the old mutual will because Thomas never gave proper notice. The common misconception here is that secrecy protects family peace; in fact, it guarantees litigation.

Can Mutual Wills Be Changed After the First Death?

No, in almost every U.S. jurisdiction the surviving spouse cannot change the essential terms of a mutual will after the first spouse dies, unless all affected beneficiaries agree in writing. The first death fixes the contract, because the deceased spouse can no longer adjust their own plan in response to a change by the survivor. Courts protect the dead spouse’s reasonable expectations by treating the survivor as a constructive trustee.

The governing principle comes from equity, not from the probate statute itself. When the survivor accepts benefits under the mutual will, such as a life estate or outright ownership, the acceptance creates a binding obligation to distribute the remaining assets according to the agreement. The Restatement (Third) of Trusts §18 calls this a constructive trust, and the remedy is enforced in state probate courts across the country.

A common misconception is that the survivor can spend freely during their lifetime. That belief is partly true, because the survivor usually retains the right to reasonable use and support, but large gifts or transfers designed to defeat the agreement are voidable. The consequence of improper depletion is a fraud-on-the-contract claim, with damages calculated against the survivor’s estate.

The Constructive Trust Remedy

A constructive trust is an equitable remedy that courts impose when legal title sits with one person but fairness demands the property be held for another. In mutual-wills cases, the survivor holds legal title to the combined estate, but equity forces the survivor to hold it in trust for the agreed beneficiaries. The leading American case is Rubenstein v. Mueller, 225 N.E.2d 540 (N.Y. 1967), where the New York Court of Appeals imposed a trust over assets the survivor tried to redirect to a new spouse.

The consequence of a constructive trust is that any property the survivor received under the mutual will, plus its appreciation, becomes traceable into the hands of later recipients. Third parties who received gifts with notice of the agreement can be forced to return the property, although bona fide purchasers for value without notice are protected.

A real-world example involves David Nakamura, a widower in Seattle who inherited his wife’s estate under their mutual will, then tried to leave everything to his new girlfriend. The Washington Court of Appeals imposed a constructive trust on the house and the brokerage account, ordering the girlfriend to return the assets to the stepchildren named in the original mutual will.

Limits on the Survivor’s Lifetime Use

The survivor is not a prisoner of the mutual-wills agreement during their remaining life. Most courts allow reasonable consumption for health, support, and ordinary enjoyment, under a standard similar to the Health, Education, Maintenance, and Support (HEMS) standard used in trust law. The survivor can sell and replace assets, pay taxes, and maintain the property without breaching the contract.

What the survivor cannot do is make large gifts designed to defeat the agreement, and the consequence of trying is often a fraud claim. Courts look at the size of the gift, the relationship with the recipient, and the survivor’s remaining resources. A gift that substantially depletes the promised estate will usually be clawed back into the constructive trust.

The common misconception is that a new marriage resets the slate. It does not. A new spouse takes subject to the mutual-wills contract, and even the spousal elective share may be reduced by the prior binding commitment in some states.

Three Common Mutual Wills Scenarios

Scenarios show how the doctrine plays out when real families meet the cold logic of probate. The three patterns below appear in nearly every reported mutual-wills decision across the United States. Each scenario illustrates a different pressure point where the surviving spouse’s wishes collide with the dead spouse’s expectations.

Scenario 1: Surviving Spouse Remarries

Survivor’s Move	Probate Result
Leaves entire estate to new spouse	Constructive trust imposed for original beneficiaries
Names new spouse as life-insurance beneficiary	Proceeds traced into trust if premium paid from contract assets
Uses joint tenancy to bypass probate	Transfer voided as fraud on the contract

The legal issue is whether the new marriage ends the mutual-wills obligation, and the answer is almost always no. Courts in jurisdictions like Florida, under Florida Statutes §732.701, require a written contract to make or not revoke a will, and that contract survives remarriage. The consequence is that the new spouse often receives far less than the survivor intended.

Scenario 2: Survivor Makes Large Lifetime Gifts

Gift Type	Legal Consequence
Birthday cash to grandchild	Usually allowed as reasonable support
Six-figure wedding gift to child	Likely voidable as depletion
Transfer of house to new partner	Clawed back through constructive trust

The rule against fraudulent depletion protects the original agreement without freezing the survivor’s daily life. Courts apply a sliding scale, and the larger the gift relative to the estate, the more likely the gift is voided. The Uniform Voidable Transactions Act may also apply when the gift defeats an enforceable contract right.

Scenario 3: Children from Prior Marriage Sue

Child’s Claim	Likely Outcome
Secret revocation before first death	Damages if notice was not given
Post-death rewrite of estate plan	Constructive trust granted
Lifetime depletion through spending spree	Partial clawback based on reasonableness

Blended-family litigation dominates the modern mutual-wills docket, because remarriage rates for widows and widowers over 55 have risen sharply since 2010, according to U.S. Census Bureau data. Stepchildren who were promised a share often find themselves cut out, and the mutual-wills doctrine becomes their only lifeline.

Named Examples of Mutual Wills Disputes

Concrete examples make the doctrine easier to apply to your own situation. The three fact patterns below use realistic names and details to show how courts handle the most common fights. Each example ends with the legal outcome and the practical lesson for families.

Example 1: Rebecca and Paul Hartley

Rebecca and Paul Hartley signed mutual wills in 2005, promising that the survivor would leave the family farm to Paul’s son from his first marriage, Ethan. Paul died in 2018, and Rebecca inherited the farm. In 2023 Rebecca tried to deed the farm to her nephew, and Ethan sued under the Iowa Probate Code Chapter 633.

The Iowa District Court imposed a constructive trust on the farm, ordering the nephew to reconvey the property to Ethan upon Rebecca’s death. The consequence for the nephew was a lost gift and a legal bill, and the lesson is that contract-based inheritance rights can override even deeded transfers. Rebecca’s common misconception was that owning the deed meant owning the right to give it away.

Example 2: Harold and Diane Whitfield

Harold and Diane Whitfield made mutual wills in Ohio in 1998, leaving everything to the survivor and then to their four children equally. Diane died in 2015, and Harold remarried in 2017. He revised his will to leave the house to his new wife, Linda.

The Ohio Court of Appeals applied Ohio Revised Code §2107.04 and found clear evidence of a mutual-wills contract. The court ordered that Linda hold the house in constructive trust for the four children after her death. The real-world consequence was years of family tension, and the lesson is that mutual wills reach across second marriages.

Example 3: Samuel and Grace Okonkwo

Samuel and Grace Okonkwo signed mutual wills in New York in 2010, promising that the survivor would preserve a charitable bequest to their church. Grace died in 2022, and Samuel tried to redirect the charitable gift to a different nonprofit he preferred.

The New York Surrogate’s Court relied on New York EPTL §13-2.1 and enforced the original charitable bequest. The consequence was that Samuel’s preferred nonprofit received nothing, and the original church received the full gift. The lesson is that even charitable beneficiaries can enforce a mutual-wills contract.

Mistakes to Avoid

Mutual wills are powerful, but they are also easy to break. The seven mistakes below account for most of the reported appellate litigation in this area. Each mistake carries a specific negative consequence, and many of them are preventable with careful drafting.

• Failing to include an express statement of contractual intent in the will, which leaves the mutual-wills claim unsupported and often fatal under UPC §2-514.
• Relying on oral promises between spouses, which fail in states like California under Probate Code §21700 and leave beneficiaries with no remedy.
• Revoking the mutual will in secret without notice to the other spouse, which converts a lawful revocation into a breach of contract and triggers damages.
• Confusing mirror wills with mutual wills, which leads clients to believe they are bound when they are not, or free when they are not.
• Making large lifetime gifts that deplete the promised estate, which invites a fraud-on-the-contract claim and possible clawback.
• Using joint tenancy or payable-on-death accounts to bypass probate, which courts routinely void when the transfer defeats the mutual-wills agreement.
• Failing to update the mutual will after major life events like divorce, remarriage, or the birth of new children, which creates ambiguity and invites litigation under UPC §2-804.

Dos and Don’ts of Mutual Wills

Clear guidance helps couples decide whether a mutual will fits their situation. The lists below draw on best practices from the American College of Trust and Estate Counsel and from leading state bar guidance. Each point includes a short why so the reasoning is transparent.

Dos: – Put the contractual promise in writing, because oral agreements fail in almost every state. – Name a neutral successor trustee or executor, because family members face conflicts of interest. – Use precise beneficiary designations, because vague terms like “my children” invite disputes about stepchildren. – Review the plan every three to five years, because tax law and family circumstances change constantly. – Coordinate with life-insurance and retirement-account beneficiary forms, because those pass outside the will and can defeat the mutual agreement.

Don’ts: – Do not sign a mutual will without independent counsel for each spouse, because conflicts can invalidate the agreement. – Do not assume a divorce erases the contract, because third-party beneficiaries can still enforce it. – Do not make large lifetime gifts after the first death, because courts may treat them as fraudulent depletion. – Do not rely on a handshake or a dinner-table promise, because courts require clear and convincing evidence. – Do not forget to coordinate with a revocable living trust, because the trust can override or conflict with the mutual will.

Pros and Cons

Mutual wills solve certain problems very well, but they create other problems in return. The balance below helps you decide if the binding nature of the contract is worth the loss of flexibility. Each point draws on the Restatement (Third) of Property and current state case law.

Pros: – Protects children from a prior marriage, because the surviving spouse cannot disinherit them. – Provides certainty about the final distribution, because the contract is enforceable in court. – Reduces family conflict over estate plans, because the terms are locked in at the first death. – Honors the reliance of the first spouse to die, because equity enforces the promise. – Works with or without a trust, because the constructive-trust remedy fills the gap.

Cons: – Removes flexibility after the first death, because the survivor cannot adapt to new circumstances. – Invites litigation from unhappy beneficiaries, because the contract creates standing to sue. – May conflict with the spousal elective share, because state statutes protect new spouses. – Complicates tax planning, because the survivor cannot easily use disclaimers or portability elections. – Requires careful drafting and ongoing review, because sloppy language triggers expensive disputes.

The Mutual-Wills Drafting Process

Drafting a mutual will requires more care than drafting a standard will. The process involves seven distinct steps, and skipping any one of them weakens the enforceability of the contract. Couples who work with experienced estate counsel can usually complete the process in four to six weeks.

The first step is a joint intake meeting where both spouses discuss their goals and any prior-marriage obligations. The second step is a conflict-of-interest disclosure, because a single lawyer representing both spouses must obtain informed written consent under ABA Model Rule 1.7. The third step is a detailed asset inventory, including life insurance, retirement accounts, and jointly owned property.

The fourth step is drafting the contractual language, which must expressly state that the wills are mutual and not mere mirror wills. The fifth step is execution with the formalities required under the state’s Wills Act, usually two witnesses and, in many states, a notary for a self-proving affidavit. The sixth step is safe storage of the originals, often with the drafting attorney or in a court deposit program. The seventh step is a scheduled review every three years, because life events can shift priorities.

Key Clauses to Include

Certain clauses are non-negotiable in a well-drafted mutual will. Leaving any one of them out can collapse the contractual layer and turn the document into a pair of mirror wills. Each clause serves a distinct protective function.

The first essential clause is a recital of contractual intent, stating that the wills are made in consideration of each other and will not be revoked except by written mutual consent. The second essential clause is a notice-of-revocation provision setting out the method and address for any permitted change during joint lifetime. The third essential clause is a constructive-trust acknowledgment, which signals to the probate court that the survivor holds the assets subject to equitable duties.

The consequence of omitting any of these clauses is uncertainty. Courts are reluctant to infer a binding contract from ambiguous language, and the loss of a clear recital can doom a claim even when the parties clearly intended a mutual will. A real-world example is Oursler v. Armstrong, 10 N.Y.2d 385 (1961), where the absence of clear contract language cost the stepchildren their inheritance.

Coordinating with Trusts and Non-Probate Transfers

Modern estate plans rarely rely on a will alone, and mutual wills must be coordinated with every other transfer mechanism. Revocable living trusts, beneficiary-designation accounts, and joint tenancies all pass outside the probate process, which means they can silently defeat a mutual-wills contract.

The consequence of poor coordination is that the survivor effectively revokes the mutual will by changing a beneficiary form. Courts sometimes treat the change as a breach of contract, but the remedy depends on tracing assets, and tracing is expensive and uncertain. A common misconception is that a mutual will overrides a beneficiary form; in fact, the form usually controls unless the court imposes a constructive trust.

The real-world example involves Jennifer Liu, a widow in Chicago who changed her 401(k) beneficiary after her husband’s death. The plan paid the new beneficiary under ERISA §404(a), and the stepchildren could only recover by tracing the funds into the new beneficiary’s assets after Jennifer died. The process took three years.

Key Court Rulings Every Reader Should Know

A handful of appellate decisions shape how modern courts handle mutual-wills disputes. Reading these cases gives you a feel for how judges weigh the evidence and apply the constructive-trust remedy. Each ruling highlights a different piece of the doctrine.

The first landmark is Dufour v. Pereira (1769), the English case that created the doctrine. Lord Camden held that a surviving spouse who accepts benefits under a mutual will becomes a trustee for the agreed beneficiaries. American courts still cite this case for the foundational rule.

The second landmark is Olive v. Biggs, 276 N.C. 445 (1970), which held that clear and convincing evidence of a contract can come from sources outside the will itself. The decision loosened the evidentiary standard in states that had required the contract to appear on the face of the will. The consequence was a wave of successful claims by disinherited beneficiaries in the 1970s and 1980s.

The third landmark is Rubenstein v. Mueller, 225 N.E.2d 540 (N.Y. 1967), which confirmed that the constructive trust reaches gifts and lifetime transfers designed to defeat the agreement. The decision extended the remedy beyond probate assets into the survivor’s entire financial life, which changed the way estate planners draft the contract.

Federal and State Law Interactions

Federal law enters the mutual-wills arena mostly through tax rules and retirement-plan preemption. The Internal Revenue Code §2056 marital deduction allows unlimited transfers between spouses at death, but the deduction interacts awkwardly with mutual-wills contracts. If the contract gives the survivor only a life estate, the deduction may be denied unless a QTIP election is made.

ERISA preemption under 29 U.S.C. §1144 overrides state property law for retirement-plan beneficiary designations. The Supreme Court confirmed in Egelhoff v. Egelhoff, 532 U.S. 141 (2001) that a state-law revocation-on-divorce statute could not alter a plan beneficiary. The consequence for mutual wills is that retirement assets often escape the contract entirely, unless the beneficiary form matches the will.

State law fills in everything else, and the rules vary widely. Some states, like Texas, require strict written evidence of the contract. Other states, like North Carolina and Tennessee, allow extrinsic evidence to prove the agreement. The practical consequence is that the same facts can produce opposite outcomes in different states.

State-by-State Snapshots

Every state has its own flavor of the doctrine, and a quick tour helps show the range. The snapshots below highlight five representative jurisdictions that together cover most of the country’s population.

California requires a written contract under Probate Code §21700, and oral promises are unenforceable. New York follows EPTL §13-2.1, which also demands a writing. Texas, under Estates Code §254.004, requires the contract to appear in the will itself.

Florida, under Statutes §732.701, requires a written contract signed by the testator. Ohio allows proof by clear and convincing extrinsic evidence under Revised Code §2107.04. The consequence of these differences is that couples who move between states should have their plan reviewed in the new state, because what worked in one place may fail in another.

Key Entities in Mutual-Wills Law

Understanding the cast of characters makes the doctrine easier to navigate. The list below names the most important people, institutions, and concepts, and explains how they connect. Each entity plays a distinct role in creating, enforcing, or defeating a mutual-wills agreement.

The testators are the two people who sign the mutual wills, usually spouses, and they are the parties to the contract. The beneficiaries are the people or charities named to receive assets, and they are third-party beneficiaries with standing to enforce the contract. The executor or personal representative administers the estate after death and must honor the contract.

The probate court supervises the administration and decides contested mutual-wills claims. The American College of Trust and Estate Counsel publishes best-practice guidance for drafters. The Uniform Law Commission drafts the Uniform Probate Code that many states follow, and the American Law Institute publishes the Restatements that courts cite for the common-law rules.

Frequently Asked Questions

Can I revoke a mutual will without telling my spouse?

No, secret revocation during joint lifetime usually breaches the contract and exposes your estate to damages or a constructive trust claim by the disappointed beneficiaries under state probate law.

Can mutual wills be changed after both spouses die?

No, once both testators have died the terms are fixed, and only a court order or the unanimous written consent of all beneficiaries can modify the final distribution.

Are mutual wills and joint wills the same thing?

No, a joint will is one document signed by both spouses, while a mutual will is two separate wills tied together by a binding contract not to revoke without consent.

Does remarriage cancel a mutual will?

No, remarriage does not erase the contractual promise, and the new spouse takes subject to the prior mutual-wills agreement in almost every U.S. state.

Can beneficiaries sue to enforce a mutual will?

Yes, third-party beneficiaries have standing to sue as intended beneficiaries of the contract, and courts can impose a constructive trust on assets the survivor tried to redirect.

Do mutual wills avoid probate?

No, mutual wills still go through probate like any other will, and avoiding probate requires a separate device such as a revocable living trust or payable-on-death account.

Can a mutual will control retirement accounts?

No, ERISA preemption usually means that the plan beneficiary form controls, and retirement assets escape the mutual-wills contract unless the form matches the agreed distribution.

Is an oral mutual-wills agreement enforceable?

No, nearly every state requires a written contract signed by the testators, and oral promises fail under statutes like California Probate Code §21700 and UPC §2-514.

Can the surviving spouse spend the inherited assets?

Yes, the survivor can use the assets for normal living expenses and reasonable enjoyment, but large gifts or transfers designed to defeat the contract can be voided by a court.

Do I need separate lawyers to sign a mutual will?

Yes, independent counsel for each spouse is strongly recommended because conflicts of interest can invalidate the agreement under ABA Model Rule 1.7 and similar state ethics rules.

Can a divorce terminate a mutual will?

Yes, divorce typically revokes provisions favoring the former spouse under UPC §2-804, but third-party beneficiaries like stepchildren can still enforce the contract.

How much does it cost to contest a mutual will?

Yes, costs can be significant, usually ranging from $15,000 to well over $100,000 depending on state, complexity, and whether the case settles before trial or proceeds to full litigation.