Yes, a grandchild can contest a grandparent’s will, but two gates stand in the way: you need standing, meaning a direct financial stake in the outcome, and you need valid legal grounds showing the will is defective. Feeling shortchanged is not a reason a court will hear. For grandchildren who clear both gates, the path involves short deadlines, a heavy burden of proof, and real financial risk.
Do You Have Standing
Standing is the threshold question, and most grandchildren fail it. The test is financial: if the will were thrown out, would you end up with more than it currently gives you? If the answer is no, the court dismisses the case immediately.
There are two usual paths to a yes. The first runs through intestacy law and the principle of right of representation. When a grandparent dies without a valid will, a grandchild steps into a deceased parent’s place in the inheritance line and takes what that parent would have received.1Justia. Intestate Succession Laws If your parent (the grandparent’s child) is still living, your parent stands ahead of you and you typically have no standing. If your parent predeceased the grandparent, you do.
The second path runs through a prior will. If an earlier version of the will named you as a beneficiary and the newer version cut you out or reduced your share, you have standing to challenge the newer document. Invalidating it may restore the earlier one, and you would benefit from that restoration.
When You May Already Be Entitled Without Contesting
Before filing anything, check whether state law has already handed you a share. Many states have pretermitted heir statutes that protect descendants who were unintentionally left out of a will. An omitted heir receives what they would have inherited if the grandparent had died without a will.2Legal Information Institute. Pretermitted Heir
The classic setup is a grandchild born after the will was signed, or a grandchild whose parent died after the will was written, creating an inheritance path that didn’t exist when the grandparent put pen to paper. If the grandparent simply never updated the document, a pretermitted heir claim can secure your share without the expense and uncertainty of a full contest. The line that matters is between being accidentally overlooked and being deliberately excluded. When the will’s language shows an intentional omission, pretermitted heir protection usually does not apply.
Legal Grounds You Would Have to Prove
Standing only gets you in the door. To actually overturn the will, you need to prove a specific legal defect. Courts begin from the assumption that a properly executed will reflects the person’s genuine wishes, and that presumption is what you are fighting.
Lack of Testamentary Capacity
To make a valid will, a person must understand four things: what property they own, who their natural heirs are, what the will does with their property, and how those pieces fit together.3Legal Information Institute. Testamentary Capacity This is a lower bar than most people expect. A grandparent can have significant memory problems or even a dementia diagnosis and still have capacity at the moment of signing.
Timing is where capacity claims become difficult. Courts recognize a “lucid interval” doctrine: a person who generally lacks capacity can still execute a valid will during a temporary period of clarity. Medical records showing cognitive decline months before or after the signing don’t prove the grandparent lacked capacity on that specific day. Winning requires evidence tied closely to the moment of execution: testimony from people who saw the grandparent that day, medical evaluations near the signing date, or proof the grandparent couldn’t recognize family members or grasp basic financial concepts during that period.
Undue Influence
Undue influence means someone in a position of trust pressured or manipulated the grandparent into changing the will. Ordinary persuasion isn’t enough; the influence must be severe enough to substitute another person’s wishes for the grandparent’s own.
Typical cases involve a caregiver, relative, or advisor who isolated the grandparent from other family, controlled information flowing in and out, and ended up with a disproportionate share of the estate. Courts look for a confidential or fiduciary relationship, an opportunity to pressure the grandparent, and provisions in the will that benefit the influencer in unexpected ways.4Justia. Undue Influence Legally Invalidating a Will When those elements are shown, many courts shift the burden to the will’s defender to prove undue influence did not occur. That shift matters, because undue influence usually happens behind closed doors and direct evidence is rare.
Fraud or Forgery
Fraud means the grandparent was tricked about what they were signing, or lied to about facts that drove their decisions. Maybe they were told the document was a power of attorney, or someone fed them a false story about a grandchild to drive a disinheritance. Forgery means the signature itself isn’t genuine. Both require strong evidence, and forgery cases almost always need a handwriting expert.
Improper Execution
Every state has formal requirements for a valid will. Generally the document must be in writing, signed by the person making it, and witnessed by two people who also sign. Skip or botch a step, and the will is vulnerable. But many wills include a self-proving affidavit, a notarized statement from the witnesses confirming they watched the signing. When that affidavit is attached, the will is presumed valid without requiring the witnesses to appear in court, and an improper-execution challenge becomes much harder.5Legal Information Institute. Self-Proving Will
The Burden You’re Up Against
The will is presumed valid. You carry the burden of proving otherwise. This isn’t the criminal standard of “beyond a reasonable doubt,” but it’s still a real obstacle. For most grounds, you need to prove your case by a preponderance of the evidence, meaning it’s more likely than not that the will is defective. Some states apply a higher “clear and convincing evidence” standard for claims like fraud or undue influence.
In practice, close cases go to the will’s defender. If the evidence is ambiguous or roughly balanced, the will stands. That’s why experienced probate attorneys evaluate the strength of the evidence before filing and often advise against contesting unless the case is strong.
No-Contest Clauses
Some wills include a no-contest clause: if you challenge the will and lose, you forfeit whatever the will did give you.6Legal Information Institute. No-Contest Clause For a grandchild who received a modest bequest but believes they deserve more, this forces an uncomfortable calculation.
Enforceability varies by state. Most states enforce the clauses, but some apply a “probable cause” exception that preserves your inheritance if you had a reasonable basis for the challenge, even if it failed.6Legal Information Institute. No-Contest Clause A handful of states, including Florida, refuse to enforce no-contest clauses at all. One important note: if the will leaves you nothing, the clause has no bite. You can’t forfeit an inheritance you were never given.
Deadlines and the Process
A contest starts with a petition filed in the probate court handling the estate. Deadlines are short, often measured in months rather than years after the will is admitted to probate, and some states allow as little as 120 days. Miss the deadline and the case is almost always over, no matter how strong the evidence. If you suspect a problem, see a probate attorney immediately rather than waiting to see how administration unfolds.
After filing, both sides enter discovery, exchanging documents, taking depositions, and issuing subpoenas. For capacity and undue influence claims, the grandparent’s medical records usually matter most, and HIPAA protects a deceased person’s health information for 50 years after death.7HHS.gov. Health Information of Deceased Individuals The executor can authorize release; if the executor isn’t on your side, you’ll likely need a court-issued subpoena. Most contests settle before trial, often through mediation that trades a share of the estate for dropping the challenge. If no deal is reached, a judge decides.
What a Win Actually Gets You
Invalidating a will doesn’t make the estate disappear. If the grandparent executed an earlier valid will, the court may revert to that document, which is often exactly what a grandchild is hoping for. If no prior will exists, the estate passes under the state’s intestacy laws, and a grandchild inherits through right of representation only if their parent predeceased the grandparent.1Justia. Intestate Succession Laws Think through this before filing. A successful contest that leaves you no better off is not a win.
What It Costs
Will contests are expensive. Probate litigation attorneys typically charge $200 to $500 or more per hour, and some will take a case on contingency for roughly 25% to 40% of any recovery. Filing fees are a few hundred dollars; the real costs are attorney time, expert witnesses, and depositions. A contest that settles during discovery can still run into tens of thousands of dollars, and a trial with capacity experts or forensic handwriting analysts runs much higher. If the court finds the contest frivolous or brought in bad faith, it can impose sanctions, including making you pay the other side’s fees. An honest initial consultation, which usually costs a few hundred dollars, is cheap compared to filing an unwinnable case.