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№ 22 Wills & Estates

Valid Grounds to Challenge a Will in New Brunswick

Learn which grounds can invalidate a will in New Brunswick, such as capacity, undue influence, fraud and signing errors, and which complaints will not work.

Wills & Estates5 min readTSLBy the Treadstone Law Team · New BrunswickUpdated November 6, 2026
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Key takeaways
  • A will can be challenged for lack of capacity, undue influence, fraud or lack of knowledge and approval, or because of problems with how it was signed, but being disappointed is not a ground.
  • Who has to prove what differs by ground: the person defending the will carries the burden on capacity and knowledge and approval, while those attacking it must prove fraud or undue influence.
  • If you are worried a will is about to be accepted by the Probate Court, a caveat can give you notice of the application, but it has strict time limits.

Finding out that a parent or relative left you little or nothing is painful, and it is natural to ask whether the will can be set aside. The law does allow a will to be challenged, but only on particular grounds. Feeling that the result is unfair is not one of them.

This article explains the grounds that can actually matter in New Brunswick, who has to prove what, and the complaints that usually do not succeed. It is general information. A lawyer can look at the facts of your situation and the documents.

This article covers the law of New Brunswick.

Complaints that are not enough on their own

Simply being disappointed or excluded is not itself a ground to overturn a will. A person can generally leave their property as they choose, subject to certain claims that are separate from a will challenge, such as a dependant's claim for support.

A will is also not revoked just because family circumstances changed, since a change in circumstances does not presumptively revoke it. There is one important exception: a will is generally revoked by the testator's later marriage unless it was made in contemplation of that marriage.

Capacity, undue influence, fraud and knowledge and approval

The Wills Act does not set out these grounds. They are decided by common-law principles, and the Probate Court follows common-law principles where nothing says otherwise.

On who must prove what, the Supreme Court of Canada in Vout v. Hay holds that the person propounding the will carries the burden on capacity and on knowledge and approval, and that burden can shift back if suspicious circumstances arise. Fraud and undue influence must be proved by those attacking the will.

GroundWho carries the burden
Testamentary capacityThe person propounding the will, shifting back if suspicious circumstances arise
Knowledge and approvalThe person propounding the will, shifting back if suspicious circumstances arise
FraudThose attacking the will
Undue influenceThose attacking the will

Signing and formality problems

A will is valid only if it is signed at its end by the testator before two or more attesting witnesses present at the same time, who then sign in the testator's presence. Electronic witnessing is allowed using real-time audio-video if at least one witness is a practising member of the Law Society of New Brunswick.

There are exceptions. A holograph will wholly in the testator's handwriting and signed needs no witnesses. Members of the Canadian Forces on active service and mariners at sea may make a signed will without witnesses. A court may also declare a document valid as a will if satisfied it embodies the deceased's testamentary intentions, even though it does not meet the formal requirements.

Other signing issues can change the outcome. A gift to an attesting witness or the witness's spouse is void as to that person, unless at least two other disinterested witnesses attested. Creditors and executors who witness are not disqualified. A person under 19 can make a will only if married (now or previously), in a regular force or on active service, or a mariner.

How a challenge can start in the Probate Court

A caveat against a grant may be lodged with the Registrar or a probate office clerk. It stays in force for six months unless withdrawn, vacated, or a notice of intent to contest is filed. No proceedings may be taken on the application without notice to the caveator.

If the caveator receives a warning, a notice of intent to contest in Form 3D must be filed within ten days of receiving it. The Court may make interested persons parties to proof of a will in solemn form or to revocation proceedings. A party served with a citation who does not file a notice of intent to contest is not entitled to notice of further proceedings.

Filing a caveat or notice of intent to contest costs $25, and instituting a contested claim or proof in solemn form costs $50.

What to do next

Frequently asked questions

Can I challenge a will just because it is unfair?

No. Being disappointed or excluded is not itself a ground to set a will aside. You would need to point to a recognized ground, such as lack of capacity, undue influence, fraud or a signing defect.

Who has to prove a person lacked capacity?

The person propounding the will carries the burden on capacity and on knowledge and approval, and it can shift back if suspicious circumstances arise. Fraud and undue influence must be proved by those attacking the will.

Is a will invalid if a witness was also a beneficiary?

Not entirely. A gift to an attesting witness or the witness's spouse is void as to that person, unless at least two other disinterested witnesses attested. Creditors and executors who witness are not disqualified. How this affects the rest of a particular will depends on the facts, so it is worth confirming with a lawyer.

What if the will does not meet the signing rules?

Usually a will must be signed before two witnesses present at the same time. A court may still declare a document valid as a will if satisfied it embodies the deceased's testamentary intentions. Whether that could apply depends on the facts.

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. New Brunswick laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a lawyer who practises in New Brunswick. Reach us at 1-844-900-1070 or send our Team a message.

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