A Last-Minute Will Change Isn't Automatically Illegal. Here's What Heirs Can Challenge

A reader recently described a painful family situation: their 93-year-old father rewrote his will at the last minute, leaving his entire estate, roughly $500,000, to the reader's brother. The brother had no job and needed somewhere to live, which the reader saw as proof the change was unfair. The question put to advisers was direct: can it be challenged?

The short answer is that feeling unfairly treated is not, by itself, a legal basis for overturning a will. A person generally has the right to leave property to whomever they choose, including a child who is struggling financially, and courts rarely second-guess a parent's favoritism. What matters is how the document was created and whether the person who signed it was able and free to make that choice.

Will contests usually rest on a few grounds. The most common are lack of testamentary capacity, meaning the person did not understand what they owned, who their family members were, and what the document did; undue influence, where someone exploited a dependent or vulnerable person to override their wishes; fraud or forgery; and improper execution, such as missing witness signatures under the rules of the state. A sudden change late in life can prompt questions about capacity and influence, but those claims rise or fall on evidence, not on timing alone.

Evidence is often where challenges succeed or fail. Useful material includes medical records from around the signing date, earlier wills and how they differed, messages showing who arranged the meeting with the lawyer, and the attorney's file if one drafted the document. Witnesses who saw the signing can matter a great deal. Living with a parent or helping with daily care does not automatically prove undue influence, but caregivers who controlled access to the parent and gained directly from the change have been successfully challenged in some cases.

Timing is critical. Many jurisdictions set short deadlines, often within a few months after a will is admitted to probate, and missing that window can end the claim. Rules vary widely by state and country, and some places require a separate lawsuit rather than a filing in probate court. It is also worth remembering that a will has no legal effect until the person dies, and the parent can still change it. Anyone considering a challenge should ask the probate court clerk when the deadline runs and consult an estate litigation attorney who can review the signing circumstances against local law. Many offer a low-cost or free first consultation, and some take will contests on contingency.