Yes, a niece or nephew can contest the will of an aunt or uncle, but only if you can show a direct financial stake in the estate and point to a recognized legal defect in the document. Being left out, or being left less than you expected, is not itself a reason a court will hear. Before you decide whether to move forward, it helps to understand exactly how standing works for nieces and nephews, which grounds courts actually accept, and what a contest costs if it goes the distance.
When a Niece or Nephew Has Standing
Probate courts only hear challenges from an “interested person,” someone with a real financial interest in the outcome. For nieces and nephews, that interest comes from one of two places.
Through Intestacy Laws
Every state has intestacy laws that decide who inherits when there is no valid will. They follow a strict priority: surviving spouse and children first, then parents, then siblings.1Legal Information Institute. Intestate Succession A niece or nephew enters that line only through “right of representation,” meaning you step into the share your parent would have taken. If the sibling of the deceased, your parent, died before your aunt or uncle, you inherit their share. If your parent is still alive, they hold the right and you have none through intestacy.
This matters because if you succeed in throwing out the will and no earlier will exists, the estate passes under those same intestacy rules. Your standing depends on whether you would actually receive something in that distribution. If closer relatives are alive and ahead of you in line, a court will conclude you have no financial interest to protect.
Through a Prior Will
The second path is more direct. If your aunt or uncle signed an earlier will that named you as a beneficiary, and a later will cut or reduced your share, you have standing to challenge the newer document. You were financially harmed by the change, which qualifies you as an interested party.2Justia. Will Contests Under the Law
Legal Grounds That Actually Work
Standing gets you into court. Winning requires proving the will itself is legally defective on one of a handful of recognized grounds.
Lack of Testamentary Capacity
At the moment of signing, the willmaker had to understand they were making a will, know roughly what they owned, recognize the people who would naturally inherit from them, and connect all of that into a coherent plan.3Legal Information Institute. Testamentary Capacity The threshold is lower than most people assume. Someone with early dementia can still have a lucid interval and sign a valid will. The question is capacity at signing, not capacity in general.
The strongest evidence is medical documentation of cognitive decline from a treating physician close to the signing date. Testimony from people who saw the person around that time also carries weight, especially if they observed confusion about money, family, or daily life.
Undue Influence
Undue influence means someone overrode the willmaker’s free choice through pressure or manipulation. Most contested wills involve this claim. The familiar pattern is a caregiver or other trusted person who isolates the willmaker, controls information, and steers changes to the estate plan that benefit themselves.
To get the claim moving, you generally need to show a confidential relationship between the alleged influencer and the willmaker, along with suspicious circumstances around the will’s creation. In most states, proving those two elements shifts the burden to the will’s defenders to show the document reflects the willmaker’s genuine wishes. That shift is powerful because it forces the other side to produce evidence instead of just denying yours.
Fraud or Forgery
Fraud means the willmaker was deceived about what they were signing, for example told a new will was just a routine document, or lied to about a family member’s conduct to prompt a disinheritance. Forgery means the signature isn’t genuine, and proving it almost always requires a qualified handwriting expert comparing the signature against known authentic samples.
Improper Execution
Wills must follow specific formalities. The willmaker generally must sign in the presence of at least two witnesses who are not beneficiaries, and those witnesses must sign as well.4Legal Information Institute. Wills – Signature Requirement Exact requirements vary by state, but a missed formality can sink the entire document. This ground shows up most often with homemade wills or documents drafted without an attorney.
Check for a No-Contest Clause First
Before filing anything, read the will for a no-contest clause, sometimes called an “in terrorem” clause. These provisions strip any beneficiary who challenges the will and loses of whatever the will left them. If the will gives you $50,000 and includes one of these clauses, a failed challenge means you walk away with nothing.5Legal Information Institute. No-Contest Clause
Most states enforce them but interpret them narrowly. Florida, by statute, refuses to enforce them at all. Many other states recognize a “probable cause” exception: if you had genuine evidence supporting the challenge, the clause won’t be triggered even if you lose. Probable cause here means evidence that would lead a reasonable person to conclude there is a substantial likelihood of success.5Legal Information Institute. No-Contest Clause
If the will leaves you something and contains this kind of clause, get an honest read on your evidence before filing. A weak case doesn’t just fail. It erases what you already had.
The Process, the Timeline, and the Cost
Will contests run on short deadlines. The clock generally starts when the will is submitted to probate, and depending on your state you may have only a few months to file. Miss it and the court won’t hear you no matter how strong the evidence. A local estates attorney can tell you the exact window.
Once filed, the case moves into discovery, where both sides collect documents and take sworn testimony from witnesses, the drafting attorney, and anyone accused of exercising influence.6American Bar Association. How Courts Work – Discovery Discovery is where cases turn, and it is also the most expensive phase. Most contests settle before trial, often through mediation, because litigation is costly and a negotiated outcome lets both sides control the result. Cases that don’t settle can stretch a year or more, and complex estates sometimes take several years.
Cost is where many people rethink filing. Probate litigators typically bill several hundred dollars an hour. Add court filing fees, deposition costs, and expert witnesses, who routinely charge over $400 an hour for trial testimony, and a case that settles early can still land in the low five figures. A case that goes through full discovery and trial can run into six. Weigh the realistic value of what you stand to gain against the likely cost and the risk of losing outright.
What Winning or Losing Actually Looks Like
If the court invalidates the will and an earlier valid will exists, that prior will governs. If no earlier will exists, the estate passes under intestacy, following the spouse, children, parents, siblings, and then descendants of siblings priority.1Legal Information Institute. Intestate Succession Winning does not guarantee a larger share. If a prior will also left you little, or closer relatives are alive to inherit under intestacy, you can win the case and still receive the same or less than the contested will gave you.
If you lose, the will stands. You owe your own attorney fees no matter the outcome. Some states allow the court to order a losing challenger to pay the other side’s costs if the contest was brought in bad faith or without reasonable cause. And if the will had an enforceable no-contest clause, you forfeit whatever it left you.