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№ 22 Wills & Estates

Who Has to Prove Undue Influence in a BC Will Challenge?

Learn who carries the burden of proof when undue influence is alleged against a will in British Columbia, and how WESA s. 52 can shift it.

Wills & Estates5 min readTSLBy the Treadstone Law Team · British ColumbiaUpdated November 1, 2026
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Key takeaways
  • Normally the person alleging undue influence or fraud has to prove it, but WESA s. 52 can move the onus to the person defending the will.
  • The onus only moves once the challenger shows the other person was in a position of potential dependence or domination.
  • A wills variation claim by a spouse or child is a separate route with a 180-day limit from the date the grant is issued.

Finding out that a parent or relative changed their will late in life, in favour of someone who was close to them, can raise hard questions. You may wonder whether the change reflected their wishes or whether someone pressured them. The first practical question is usually: who has to prove what?

In British Columbia the answer depends on a general rule and an important statutory exception. This article explains the burden of proof, how a challenge reaches court, and where a different kind of claim may fit. It is general information, not advice on your situation.

This article covers the law of British Columbia.

The starting rule: the challenger proves it

Undue influence means a will reflects pressure from someone else rather than the will-maker's own wishes. Under the general approach set out in Vout v. Hay, a person who alleges undue influence or fraud usually still has to prove it.

Suspicious circumstances do not change that on their own. They may raise a suspicion of fraud or undue influence, but they do no more than rebut the presumption of capacity and of knowledge and approval. Where the suspicious circumstances relate to mental capacity, the person putting forward the will takes back the legal burden of establishing capacity.

How WESA section 52 can shift the onus

Section 52 of the Wills, Estates and Succession Act (WESA) changes the starting rule in one situation. If a person claims a will resulted from undue influence and shows the other person was in a position of potential dependence or domination, the party defending the will must prove that no undue influence was exercised.

The challenger carries the first step. The government explainer describes this as showing that the other person was in a position of potential dependence or domination over the will-maker and that the position was used to influence the will. Only then does the onus move to the defender. This lines up the rules for wills with those for gifts made during life.

SituationWho carries the burden
Challenger cannot show potential dependence or dominationThe challenger must prove undue influence or fraud
Challenger shows potential dependence or domination (s. 52)The person defending the will must prove no undue influence was exercised
Suspicious circumstances relating to capacityThe person putting forward the will must establish capacity

Standard of proof and what suspicion does

Suspicious circumstances do not raise the standard of proof. The evidence is looked at more carefully in line with how serious the suspicion is, but the standard remains the balance of probabilities.

In plain terms, a challenger does not need certainty, but needs evidence that makes the claim more likely than not. What counts as a position of potential dependence or domination, and what evidence shows it, depends heavily on the facts, so a lawyer can help you assess it.

How a challenge reaches court

Filing a notice of dispute does not last forever. It generally lasts one year unless renewed by court order, and a person may not file more than one for any one estate. Check current rule numbering and forms before relying on them, since the probate rules have been amended.

A different route: wills variation, and what to do next

If you are a spouse or child who was left out, you may not need to prove undue influence at all. If a will does not, in the court's opinion, make adequate provision for the proper maintenance and support of the will-maker's spouse or children, the court may order provision out of the estate that it thinks adequate, just and equitable.

A wills variation proceeding must be started within 180 days from the date the representation grant is issued in British Columbia. A copy of the initiating pleading must be served on the executor no later than 30 days after that 180-day period, with provision for extensions of time. Time limits for a validity challenge are less simple, and which limitation period applies depends on the type of proceeding, so get advice early.

Frequently asked questions

Who has to prove undue influence in BC?

Usually the person alleging it must prove it. If they show the other person was in a position of potential dependence or domination, WESA s. 52 puts the onus on the person defending the will to prove no undue influence was exercised.

Do suspicious circumstances automatically cancel a will?

No. They rebut the presumption of capacity and of knowledge and approval, but a person alleging undue influence or fraud generally still has to prove it, except where s. 52 shifts the onus.

What standard of proof applies?

The standard stays the balance of probabilities. Suspicious circumstances do not raise it, but the evidence is examined in line with how serious the suspicion is.

Can I claim if I was left out but cannot prove undue influence?

A spouse or child may be able to bring a wills variation claim, asking the court to order adequate provision under s. 60. It must be started within 180 days from the date the grant is issued in British Columbia.

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. British Columbia 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 British Columbia. Reach us at 1-844-900-1070 or send our Team a message.

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