Can a sibling contest a parent’s will in New York?

March 16, 2026

Can a sibling contest a parent’s will in New York?

Losing a parent is hard enough. When the will names one sibling as the main heir or leaves another out entirely, tensions can rise quickly. If you believe a parent’s will does not reflect their true wishes, New York law allows you to challenge it in Surrogate’s Court.



Who can file a will contest

Not everyone can contest a will. Under New York law, you must have legal standing. This means you must be someone who would inherit if the will were invalid. Siblings qualify as distributees only if the parent left no surviving spouse and no surviving children or grandchildren.


A sibling may also have standing if named in a prior will and set to receive less under the current one. Timing matters as well. Objections must generally be filed before the will is admitted to probate, by the return date listed on the court citation or within 10 days of completing witness examinations.


Grounds for contesting a will

New York courts recognize several reasons to challenge a will. Common grounds for will contests include:

  • Lack of mental capacity: The parent did not understand what they owned, who their heirs were or what signing a will meant.
  • Improper execution: The will was not signed or witnessed according to New York’s legal requirements.
  • Undue influence: Someone pressured a person in a weakened state to change their wishes.
  • Fraud: Lies caused the parent to divide property differently than intended.


Each ground requires specific evidence, and courts set a high bar for overturning a properly executed will.


What courts look for

Surrogate’s Court examines evidence closely before invalidating a will. Judges want to see medical records, witness statements and documentation showing the parent could not make decisions freely. Simply feeling hurt or left out is not enough. Courts require proof that something went wrong during the creation of the will or its signing.


How a contest can end

If the court finds the will invalid, it may throw out the entire document or just the problematic parts. The estate would then pass under a prior valid will or, if none exists, under New York’s intestacy rules. These rules divide property among surviving family members based on their relationship to the deceased.


What to weigh before filing

Will contests can take months or years to resolve and may strain family relationships further. Before filing, consider whether the evidence supports your claim and whether the outcome you seek is realistic. When the grounds are strong and the documentation is solid, a contest can be the only way to ensure a parent’s true wishes are honored.

Older man and woman smiling on a sofa as she adjusts his glasses in a cozy living room.
October 23, 2026
Does a will make probate faster in NYC? Learn what reduces delays, how New York probate works, and what to discuss with McGarry & Simon about your estate.
Two people standing by a calm lakeshore, looking into the distance
September 22, 2026
Can a will expire in New York? Learn how older wills remain valid, when estate plans should be updated, and how McGarry & Simon assists New York City residents.
Judge’s gavel on wooden desk beside a document, with a blurred person writing in the background
August 25, 2026
Learn what happens when an asset is left out of a will in New York and how omitted property may be distributed. Contact McGarry & Simon for estate planning assistance in New York City.
People reviewing a document at a table, pointing and discussing details.
July 23, 2026
Learn what a family trust is, how it works, and the benefits it can provide. McGarry & Simon helps individuals and families throughout New York City with estate planning and trust creation.
Two smiling people at a table speaking with a person in the foreground, in a bright room.
June 29, 2026
Estate Planning for Retirees in New York: Learn why reviewing your will, trusts, powers of attorney, and long-term care plans after age 65 is important. McGarry & Simon provides estate planning legal assistance throughout New York.
Large stone building with classical columns and a grand entrance covered in a light dusting of falling snow.
May 1, 2026
Learn how long probate takes in New York, what factors affect the timeline, and how McGarry & Simon can assist New York City families through the process.
A hand holds a white pen and writes on a paper form placed on a wooden desk.
March 31, 2026
Learn what types of assets can be included in a New York estate plan, from real estate and financial accounts to digital assets. McGarry & Simon assists New York City residents.
what happens to your digital assets when you die
February 13, 2026
What happens to your digital assets when you die?
differences between revocable and irrevocable trusts
February 5, 2026
5 key differences between a revocable and an irrevocable trust
Two people at a desk, possibly lawyers, with documents, a gavel, and a laptop.
January 21, 2026
After agreeing to be an executor of your loved one’s estate, you likely saw it as a final act of love. However, this role comes with fiduciary responsibilities you must meet. Under the eyes of New York law, you must act with care and diligence that a prudent person would exercise in managing their own affairs. Committing a mistake could make you liable for losses. Understanding the breach of fiduciary duty Fiduciary duty refers to the strict legal obligation to manage a decedent’s estate with loyalty, care and good faith. Failing to uphold this can cause the beneficiaries, heirs or creditors of the estate to sue you for a breach of fiduciary duty. Common pitfalls can include: Stealing or mismanaging the estate funds Refusing to communicate or update interested parties Delaying the estate administration unreasonably Selling estate assets under market value Favoring one interested party more than the other Committing any of these mistakes can make an interested party prove that you are unfit for the role, removing you from your position as executor. Protecting yourself from errors Despite the difficulties involved, you still want to honor the wishes of your loved one. Start by being proactive. Here are a few tips you can consider to move forward: Research laws related to estate administration. Document all actions you take during the probate process . Work with professional appraisers to accurately value complex assets. Never mix estate funds with your own. Taking the role of executor can be a heavy burden to carry, but you do not have to face this alone. Seeking legal guidance from an attorney can be a valuable resource. They can offer helpful insights on maintaining your fiduciary duty.