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№ 22 Wills & Estates

How to Prove Undue Influence on a Will in British Columbia

Learn who must prove undue influence on a will in British Columbia, how WESA s. 52 can shift the burden, and the deadlines and steps to consider.

Wills & Estates5 min readTSLBy the Treadstone Law Team · British ColumbiaUpdated November 1, 2026
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Key takeaways
  • The person alleging undue influence generally has to prove it, unless they first show the other person was in a position of potential dependence or domination, which shifts the onus under WESA s. 52.
  • Suspicious circumstances alone do no more than rebut the presumption of capacity and of knowledge and approval; they do not by themselves prove undue influence.
  • Different claims have different clocks, so a notice of dispute, a wills variation claim and a validity challenge should be looked at early.

You may have a sense that someone close to the deceased pressured them into changing a will, perhaps by isolating them, controlling their care, or steering their decisions. That feeling is common in estate disputes, but a court needs more than a feeling. It needs evidence, and the law sets out who must produce it.

This article explains how undue influence works in a British Columbia will challenge, what the challenger must show first, when the burden moves to the person defending the will, and which timing points to look at early. It is general information, not advice on your situation.

This article covers the law of British Columbia.

What undue influence means and where the rule comes from

In plain words, undue influence means the will reflects someone else's pressure rather than the will-maker's own free choice. In British Columbia, the Wills, Estates and Succession Act (WESA) deals with it in section 52. The provincial government explains that this approach lines up undue influence in wills with undue influence in gifts made during a person's lifetime.

Probate is the court process that confirms a will. It checks that the will was made without fraud or undue influence, and a will that passes those checks is described as valid. Probate checks are not the same as a full contest, which is why a family member with real concerns may need to take active steps.

Who has to prove what

The starting point is that a person who alleges undue influence or fraud bears the burden of proving it. Section 52 changes that in one situation. If you claim a will resulted from undue influence and show that 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. You must show that the other person was in a position of potential dependence or domination over the will-maker and that this position was used to influence the will. Only then does the onus move to the defender. Without that showing, the ordinary rule applies and you carry the burden.

StageWho must actWhat is required
First stepThe challengerShow a position of potential dependence or domination, used to influence the will
If shownThe person defending the willProve that no undue influence was exercised
If not shownThe challengerProve undue influence or fraud under the ordinary rule

Building the evidence

The law does not hand you a checklist of exact evidence, so the practical task is to gather material that speaks to the two questions above: the relationship between the two people, and how that relationship affected the will. Witnesses to the signing can be key evidence in disputes about how a will was signed, and signing witnesses must be 19 or older.

If you do not have the documents, the court can order a person who controls or possesses certain documents or property to produce and bring them to court, which a challenger can use to obtain original wills and related papers.

Other routes and timing points

If you are a spouse or child who was left out, undue influence is not your only option. Under WESA s. 60, if a will does not make adequate provision for the proper maintenance and support of a spouse or child, the court may order provision out of the estate that it thinks adequate, just and equitable. A wills variation proceeding must be commenced 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.

A person who receives notice of a probate application may oppose a grant by filing a notice of dispute (Form P29) under Rule 25-10. Filing one prevents a grant from being issued before the person can apply for an order requiring security. The personal representative must also not distribute the estate within 210 days after the grant, except by court order, which gives a window to act.

The general limitation period is 2 years from the day the claim is discovered. Whether it governs a validity challenge depends on the type of proceeding, so treat the deadline cautiously and confirm it with a lawyer. A limitation period set under another enactment can also displace the general one.

What to do next

Because the first-step showing under section 52 decides who carries the burden, it is worth talking to a lawyer before deciding how to proceed.

Frequently asked questions

Who has to prove undue influence on a will in BC?

Generally the person alleging it. If that person shows the other party was in a position of potential dependence or domination, section 52 puts the onus on the party defending the will to prove no undue influence was exercised.

Is suspicion enough to win?

No. Suspicious circumstances do no more than rebut the presumption of capacity and of knowledge and approval, and the person alleging undue influence or fraud generally still has to prove it, except where section 52 shifts the onus.

Can I oppose probate while I decide what to do?

A person who receives notice of a probate application may file a notice of dispute under Rule 25-10. It prevents a grant from being issued before you can apply for an order requiring security. A lawyer can explain how long it lasts and how it can be removed.

What if I was left out of the will but cannot prove pressure?

A spouse or child may be able to bring a wills variation claim for adequate maintenance and support under section 60. It must be commenced 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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