How to Disinherit a Sibling in New York

Reviewed by Albert Goodwin, Esq., a New York estate and probate attorney admitted to the New York State Bar. Last updated February 2025.

A frequent question we hear is whether you need legal “grounds” to disinherit a sibling in New York. The short answer is no. Unlike a surviving spouse, an adult sibling has no statutory right to inherit from you over your objection. You do not have to justify your reasons or prove that your sibling did anything wrong. What matters is not why you want to disinherit a sibling, but how you do it so that your wishes hold up after your death.

This page explains New York law on disinheriting a brother or sister, how to structure a will or trust to accomplish it, the limited situations in which a disinherited sibling could still challenge your estate plan, and when a protective trust is a better tool than outright disinheritance. To discuss your specific situation with an estate attorney, you can call Albert Goodwin at (212) 233-1233.

Siblings Have No Protected Inheritance Rights in New York

New York protects only a surviving spouse from being completely cut out of an estate. Under the elective share statute, EPTL 5-1.1-A, a surviving spouse may claim the greater of $50,000 or one-third of the net estate regardless of what the will says. There is no comparable protection for siblings, children, or any other relative.

Because a brother or sister is not a protected heir, a competent adult is free to leave a sibling nothing. You may give your estate to other family members, friends, charities, or anyone you choose. The sibling cannot demand a share simply because of the family relationship.

What Happens to a Sibling Without a Will (Intestacy)

If you want to ensure a sibling does not inherit, you cannot rely on doing nothing. New York’s intestacy statute, EPTL 4-1.1, governs who inherits when a person dies without a valid will. Under that statute, distribution follows a fixed order:

• A surviving spouse and children share the estate first.
• If there is no spouse and no descendants, the estate passes to the decedent’s parents.
• If there are no surviving parents, the estate passes to the decedent’s siblings (and to the children of any deceased siblings, by representation).

In other words, if you have no spouse, no children, and no living parents, your siblings are your default heirs under New York law. The only reliable way to keep a sibling from inheriting in that situation is to sign a valid will (or fund a non-probate plan such as a trust or beneficiary designations) that directs your property elsewhere. Silence benefits the sibling; an affirmative estate plan is what disinherits them.

How to Disinherit a Sibling With a Valid New York Will

To disinherit a sibling, your will must be valid and clearly expressed. Two things matter:

1. Proper Execution Under EPTL 3-2.1

New York imposes strict formalities for executing a will under EPTL 3-2.1. The will must be in writing, signed by the testator at the end, and the signing must be witnessed by at least two attesting witnesses, who sign within thirty days of one another. The testator must declare to the witnesses that the document is their will. A will that is not executed with these formalities can be denied probate — which could send the estate back into intestacy, where a sibling may then inherit. Proper execution is therefore essential to making a disinheritance stick.

2. Clear, Unambiguous Language

You generally do not need to name the disinherited sibling at all; if you leave your entire estate to named beneficiaries, anyone not named takes nothing. However, where there is family history or a risk of a challenge, many attorneys recommend naming the sibling and stating plainly that you intend to leave that person nothing. A clear statement reduces the chance that a court interprets the omission as an oversight and makes your intent unmistakable.

Using a No-Contest (In Terrorem) Clause

If you are concerned that a sibling who receives a small gift may still litigate, you can include a no-contest clause, also called an in terrorem clause, authorized by EPTL 3-3.5. Such a clause provides that a beneficiary who challenges the will forfeits whatever was left to them. For the clause to have any deterrent effect, the sibling must actually be given something worth losing — a clause has no bite against a sibling who is left nothing.

New York limits the reach of no-contest clauses. Under EPTL 3-3.5, certain conduct is expressly permitted and will not trigger a forfeiture, including, among other things, an objection to the court’s jurisdiction, a challenge to the will’s execution by a person under 21 or under disability, and the preliminary examination of the will’s preparation and the attesting witnesses under SCPA 1404. Because of these safe harbors, a no-contest clause discourages but does not entirely prevent litigation, and it must be drafted carefully.

When a Disinherited Sibling Can Still Challenge the Will

A sibling who is cut out cannot win simply by objecting to being disinherited — New York law allows disinheritance. To overturn the will, the sibling (who must have standing, generally as a person who would inherit under intestacy or under a prior will) must prove a recognized ground in a contested probate proceeding in Surrogate’s Court. The most common grounds are:

• Lack of testamentary capacity. The challenger claims the testator did not understand the nature of making a will, the extent of their property, or the natural objects of their bounty at the time of signing.
• Undue influence. The challenger claims a beneficiary exerted such pressure that the will reflected that person’s wishes rather than the testator’s free choice. This is often raised where a caretaker or one favored sibling was deeply involved in arranging the will.
• Fraud. The challenger claims the testator was deceived by false statements that affected the terms of the will.
• Improper execution. The challenger claims the will did not meet the formalities of EPTL 3-2.1.
• Forgery or revocation. The challenger claims the document is not genuine or was later revoked.

A disinheritance carried out through a properly executed, attorney-supervised will — ideally with witnesses available to confirm the testator’s capacity and the absence of coercion — is far harder to overturn. If you anticipate a fight, you can learn more about the process on our pages about will contests and breach of fiduciary duty.

Disinheritance vs. a Protective Trust

Sometimes the goal is not to punish a sibling but to protect an inheritance from third parties or from the sibling’s own circumstances. In those situations, outright disinheritance is often the wrong tool. A properly drafted trust lets you provide for the sibling while controlling how and when the funds are used:

• Addiction or money-management concerns. Rather than leaving cash to a sibling struggling with gambling, drugs, or alcohol, you can leave the inheritance in a discretionary trust managed by an independent trustee who releases funds for the sibling’s benefit.
• Creditors. A trust with appropriate spendthrift provisions can help shield an inheritance from a sibling’s creditors.
• Divorce or a troubled marriage. Keeping the inheritance in trust, rather than gifting it outright, can help keep assets out of a sibling’s divorce.
• Disability and government benefits. For a sibling who is disabled and receiving needs-based benefits such as Medicaid or SSI, an outright inheritance can disqualify them. A third-party supplemental needs trust under EPTL 7-1.12 can supplement the sibling’s quality of life without jeopardizing eligibility.

To explore these options, see our pages on the benefits of a special needs trust, the benefits of a living trust, and our general trust attorney services.

Practical Steps to Disinherit a Sibling in New York

1. Decide whether you want true disinheritance or a controlled gift through a trust.
2. Sign a will that meets EPTL 3-2.1 execution formalities, drafted with clear language about your intent.
3. Coordinate non-probate assets — life insurance, retirement accounts, and “payable on death” accounts pass by beneficiary designation, not by your will, so update those designations.
4. Consider an attorney-supervised signing and documentation of capacity if you expect a contest.
5. Add a tailored no-contest clause under EPTL 3-3.5 if a sibling will receive a gift you want to protect from litigation.
6. Review your plan periodically as family circumstances and the law change.

Speak With a New York Estate Attorney

Whether you are planning your own estate or you are a sibling concerned about an inheritance, the rules in New York Surrogate’s Court are specific and the stakes are high. To discuss how to disinherit a sibling, how to structure a protective trust, or whether a will can be challenged, call New York wills, trusts, and estates attorney Albert Goodwin at (212) 233-1233.

This article is general legal information about New York law and is not legal advice for your specific situation. No attorney-client relationship is created by reading it.