When a loved one passes away, their estate is often settled through the probate process, which involves validating the will. However, sometimes disagreements arise, leading to estate litigation. Understanding the common grounds for challenging a will can help parties navigate these disputes effectively. Estate litigation encompasses a range of legal actions, including will contests, challenges to trust validity, and disputes over fiduciary conduct. While the probate process aims to distribute assets according to the decedent's wishes, conflicts may surface when beneficiaries, heirs, or other interested parties suspect wrongdoing or legal defects. These disputes can be emotionally and financially draining, but they serve an essential purpose: ensuring that only valid, properly executed wills are admitted to probate.

Challenging a will is not a step to be taken lightly. Courts generally presume that a will is valid if it appears properly executed. The burden of proof rests on the challenger to present clear and convincing evidence that the will is invalid. This high standard underscores why it is crucial to understand the recognized legal grounds for contest. In the sections that follow, we examine each ground in detail, exploring the elements that must be established, common evidentiary issues, and practical considerations.

There are several established reasons why a will might be contested in court. These grounds typically focus on issues related to the validity of the will or the circumstances under which it was created. Each ground requires specific factual support and often draws on testimony from witnesses, medical records, or expert analysis. Below, we break down the most commonly asserted grounds.

1. Lack of Testamentary Capacity

This ground asserts that the testator (the person who made the will) did not have the mental capacity to understand the nature and consequences of their actions when creating the will. Factors such as mental illness or cognitive decline at the time of signing can be relevant. The legal test for testamentary capacity varies slightly by jurisdiction, but a widely accepted formulation requires that the testator understood:

  • The nature and extent of their property (i.e., what they owned).
  • The natural objects of their bounty (the family members or loved ones who would ordinarily inherit).
  • The disposition they were making (how they chose to distribute their assets).
  • And that they were making a will – a document that takes effect after death.

Capacity is assessed as of the exact moment the will was signed. Evidence of dementia, Alzheimer’s disease, or other cognitive impairments before or after execution may be relevant, but the challenger must show that the testator lacked capacity at that precise time. Medical records, testimony from attending physicians, and lay witness observations can all help prove incapacity. A common scenario involves a testator with late‑stage dementia who executes a will in a nursing home; if the medical notes indicate confusion or disorientation, the will may be vulnerable. However, courts also recognize that a testator can have “lucid intervals” – temporary periods of clarity – so even a documented diagnosis does not automatically invalidate a will.

2. Undue Influence

Undue influence occurs when another person exerts excessive pressure on the testator, effectively manipulating them into making or changing a will. Evidence might include suspicious circumstances or the testator’s dependence on the influencer. The classic elements of undue influence are:

  1. The influencer had an opportunity to exert influence (e.g., they lived with or cared for the testator).
  2. The influencer was in a position of trust or confidence, or the testator was susceptible to influence due to age, illness, or dependency.
  3. The influencer actively participated in the preparation or execution of the will.
  4. The resulting will is unnatural – that is, it dramatically departs from what the testator would have done absent the influence (e.g., disinheriting close family in favor of a new friend).

Undue influence is often subtle and difficult to prove with direct evidence. Courts look to circumstantial evidence such as the testator’s isolation from family, sudden changes in estate planning, and the influencer’s involvement in attorney meetings. For example, if a caregiver brings the testator to a new lawyer, translates documents, and instructs the lawyer on what to write, that may constitute undue influence. Suspicious timing – such as a will executed days before death – can also raise red flags. It is important to note that mere persuasion or nagging is not enough; the influence must be so overpowering that the testator’s own free will is overcome.

3. Fraud or Forgery

If the will was forged or procured through fraudulent means, it can be challenged. This includes situations where the signature is falsified or the document was manipulated without the testator’s knowledge. Two primary types of fraud exist: fraud in the execution and fraud in the inducement.

  • Fraud in the execution occurs when the testator is tricked into signing a document they believe to be something else (e.g., they think they are signing a power of attorney but actually sign a will). This is rare because most will executions are supervised by attorneys and witnesses.
  • Fraud in the inducement involves knowingly false statements made to the testator that cause them to make or change their will. For instance, if a beneficiary lies about a family member’s misconduct to persuade the testator to disinherit that person, the resulting will may be invalid. The challenger must show that the testator relied on the misrepresentation and would not have made that disposition without it.

Forgery is a separate ground: if the signature on the will is not the testator’s, the will is void. Handwriting experts can compare signatures, and the absence of credible witnesses may support a forgery claim. In addition, a will may be challenged as a “fraud on the court” if it was procured by perjury in a prior proceeding.

4. Improper Execution

The will was not properly signed or witnessed according to legal requirements. Each state has its own statutes governing will formalities, but most require:

  • The testator must sign the will (or direct another to sign in their presence).
  • The testator’s signature must be made or acknowledged in the presence of at least two witnesses (some states require three for real property, but two is typical).
  • The witnesses must sign in the testator’s presence and in the presence of each other.
  • The testator must declare that the document is their will.

If any of these formalities are missing, the will may be denied probate. Challenges based on improper execution are common when a “holographic” (handwritten) will is presented, but even formally prepared wills can have errors – for example, the witnesses might not have been present at the same time, or the testator may have signed before the witnesses arrived. Some states have “harmless error” statutes that allow a will to be admitted if the proponent can prove by clear and convincing evidence that the testator intended the document to be their will, but this is not universal. It is critical to check the specific execution requirements of the state where the will was made.

5. Revocation

The will was revoked by the testator through a subsequent document or physical act. A valid will can be revoked either by:

  • Subsequent will or codicil: A later will that expressly revokes prior wills, or one that is inconsistent to the extent that the prior will cannot stand.
  • Physical act: The testator tears, burns, obliterates, or otherwise destroys the will with the intent to revoke it. The destruction must be done by the testator (or by another in their presence and at their direction) with the clear intention of revocation.

A challenge based on revocation typically arises when the original will cannot be found at death. Many states have a presumption that if the will was last seen in the testator’s possession and cannot be located after death, the testator revoked it by destruction. The person seeking to probate the lost will must rebut that presumption with evidence that it was not revoked – for example, by showing the will was accidentally lost or destroyed by a third party without the testator’s intent. Additionally, some jurisdictions recognize partial revocation by physical act (e.g., crossing out a clause), but this can raise complicated issues.

6. Ambiguity

The language of the will is unclear, leading to potential misinterpretation. Ambiguities may be patent (obvious on the face of the will) or latent (discovered only when applying the will to actual facts). Patent ambiguities might include contradictory terms – such as “I leave all my property to my sister, Mary Smith, and to my brother, John Smith, equally” without stating whether they take as joint tenants or tenants in common. Latent ambiguities arise when the words describe a person or property that fits multiple individuals or items – for example, a bequest to “my cousin John” when the testator has two cousins named John.

In most states, a challenger can use extrinsic evidence (facts outside the will) to clarify a latent ambiguity, but courts are more reluctant to admit such evidence for patent ambiguities. If the ambiguity cannot be resolved, the gift may fail or the court may resort to default intestacy rules. Ambiguity challenges are less common than other grounds because courts prefer to give effect to the testator’s intent if possible, but they can be powerful when the will’s language is genuinely incomprehensible.

Additional Considerations

Standing to Challenge

Not everyone can contest a will. Only an “interested person” has standing – typically someone who would inherit under the prior will or by intestacy if the challenged will is invalid. In some states, a creditor of the estate may also have standing if the will affects their ability to collect a debt. A challenger must demonstrate that their interest would be harmed by the admission of the will. For example, a disinherited child who would have inherited without a will clearly has standing; a distant cousin who would not inherit either way does not. Some jurisdictions also permit a personal representative nominated in an earlier will to contest a later will.

No-Contest Clauses

Many wills include a “no-contest” clause (also called an in terrorem clause) that disinherits any beneficiary who challenges the will without probable cause. If a beneficiary files a contest and loses, they forfeit their inheritance under the clause. However, most states carve out exceptions: a challenge with “probable cause” (reasonable grounds supported by facts) will not trigger the forfeiture. Additionally, certain states (e.g., Florida, California) limit the enforceability of no-contest clauses, particularly for challenges based on fraud, duress, or lack of capacity. Before contesting, it is essential to evaluate whether a no-contest clause applies and whether you have sufficient evidence to qualify under the safe harbor.

Statutes of Limitations

Will contests are subject to strict deadlines. After the will is offered for probate, interested persons receive notice, and the time to object is typically limited to a few months – often 90 to 120 days. If no objection is filed within that window, the will may become final even if it could have been challenged. Some states also allow a later contest based on fraud or forgery, but those too have limitations periods. For example, in California, a will contest must generally be brought within 120 days of the admission of the will to probate. A prospective challenger should act promptly to avoid losing the right to contest.

The Estate Litigation Process for Will Contests

A will contest typically begins with a formal objection filed with the probate court. The court then sets a hearing, and both sides engage in discovery (production of documents, depositions, requests for admissions). The burden of proof is on the challenger for most grounds, except for lack of proper execution in some states. If the case proceeds to trial, the court (or a jury, in some jurisdictions) will determine the validity of the will. Many will contests settle before trial through mediation, especially when the cost of litigation is high and the outcome uncertain. The court may also allow limited discovery before ruling on a summary judgment motion if the evidence is undisputed.

If the will is invalidated, the estate typically passes according to a prior valid will (if one exists) or under the state’s intestacy laws. If only a portion of the will is void, the court may sever that part and admit the rest. The entire process can take months or years, depending on the complexity and the court’s docket.

Practical Advice for Challenging a Will

Because estate litigation is both legally complex and emotionally charged, taking the right steps early is critical. Here are some practical recommendations:

  • Consult an experienced estate litigation attorney. An attorney familiar with local probate rules can evaluate whether you have a viable claim and help you meet deadlines. Many firms offer initial consultations.
  • Preserve evidence. Collect medical records, copies of earlier wills, financial documents, emails, text messages, and any notes indicating the testator’s intentions. Witness testimony about the testator’s mental state or the drafting process can be invaluable.
  • Act quickly. File a caveat or objection as soon as you learn of the will’s admission to probate. Delays can forfeit your rights.
  • Consider mediation. Will contests can drain the estate and sour family relationships. Mediation offers a confidential, less adversarial avenue to resolve disputes, often preserving more of the estate for beneficiaries.
  • Understand the costs. Litigation is expensive. Attorney fees, expert witness fees, and court costs can quickly exceed the value of a modest bequest. Weigh the potential recovery against the expense.

Challenging a will can be complex and emotionally taxing. It is advisable to consult with an experienced estate attorney to evaluate the validity of the grounds and navigate the legal process effectively. For foundational guidance, the American Bar Association’s Real Property, Trust and Estate Law Section offers resources on estate planning and litigation. Additionally, Cornell Legal Information Institute’s overview of wills provides a clear legal framework. For state-specific statutes, consult your local probate code; many states’ laws are accessible via Nolo’s Will Contest FAQ.

Conclusion

Will contests are among the most challenging disputes in probate law. They require a careful understanding of the legal grounds, strict adherence to procedural rules, and often a significant investment of time and resources. Whether you are considering challenging a will or defending one, knowing the common grounds – lack of capacity, undue influence, fraud, improper execution, revocation, and ambiguity – gives you a framework for evaluating the situation. While no one enters estate litigation lightly, the legal system provides these mechanisms to uphold the integrity of the decedent’s final wishes and to protect those whose rights would otherwise be unjustly subverted. With the guidance of a skilled attorney and a clear strategy, you can navigate these turbulent waters and reach a resolution that honors both the law and the lasting intentions of the person you have lost.