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№ 22 Wills & Estates

Signs of Undue Influence on an Elderly Parent's Will in BC

See what undue influence means under British Columbia law, the warning signs adult children often notice, and how the onus can shift when a will is challenged.

Wills & Estates4 min readTSLBy the Treadstone Law Team · British ColumbiaUpdated November 6, 2026
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Key takeaways
  • Under WESA s. 52, once a challenger shows a position of potential dependence or domination, the person defending the will must prove no undue influence was exercised.
  • Without that showing, the person alleging undue influence or fraud generally bears the burden of proving it.
  • Warning signs help you decide what to record and ask about, but whether they matter in court depends on the full facts.

You may have noticed a caregiver, a sibling or another relative controlling who sees your parent, handling their money or speaking for them. When a will then changes, it is natural to worry that your parent did not make that decision freely.

This article explains how British Columbia law frames undue influence, which situations the law pays attention to, and what you can sensibly note and do. It describes the general approach and is not a checklist that proves a case.

This article covers the law of British Columbia.

What undue influence means in plain words

Undue influence means a will reflects someone else's pressure rather than the will-maker's own free choice. It is different from lack of mental capacity, which asks whether the will-maker was mentally capable. A parent can be capable and still be pressured, and a parent can lack capacity without anyone pressuring them.

Careful or persuasive family conversations are not automatically a problem. The legal question is whether a person in a position to dominate used that position to influence the will.

How the law uses dependence and domination

WESA s. 52 says that 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 has the onus of proving that no undue influence was exercised. The challenger carries the first step: showing that the other person was in that position over the will-maker and that the position was used to influence the will.

This lines up undue influence in wills with undue influence in gifts made during life. If the challenger cannot make that first showing, the ordinary rule applies and the person alleging undue influence or fraud bears the burden of proving it. That is why the facts about the relationship matter so much.

Warning signs adult children often notice

The following are common concerns families raise. They are observations to record, not legal tests, and none of them proves undue influence by itself. How much weight a court gives any of them depends on the evidence as a whole.

Suspicious circumstances and capacity

In Vout v. Hay, the Supreme Court of Canada addressed suspicious circumstances in will disputes. Where suspicious circumstances relate to mental capacity, the person propounding the will reassumes the legal burden of establishing testamentary capacity. Suspicious circumstances do not raise the standard of proof. The evidence is scrutinized in accordance with the gravity of the suspicion, and the standard remains the balance of probabilities.

Suspicious circumstances, even if they raise a suspicion of fraud or undue influence, do no more than rebut the presumption of capacity and of knowledge and approval. A person alleging undue influence or fraud generally still has to prove it, except where WESA s. 52 shifts the onus. Because those points should be checked against the judgment itself, ask a lawyer how they apply to your facts.

What to do next

If you are a spouse or child and cannot prove incapacity or undue influence, WESA s. 60 offers a different route: the court may order provision out of the estate if the will does not make adequate provision for proper maintenance and support. That claim has its own 180-day deadline from the grant.

Frequently asked questions

Who has to prove undue influence in British Columbia?

Generally the person alleging it. But if they show 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.

Is a caregiver inheriting automatically undue influence?

No. A gift to a caregiver is not undue influence by itself. The question is whether the caregiver was in a position of potential dependence or domination and used it to influence the will.

Is undue influence the same as lack of capacity?

No. Capacity asks whether the will-maker was mentally capable, while undue influence asks whether someone else's pressure produced the will. A dispute can raise both arguments.

What if I cannot prove undue influence but was left out?

A spouse or child may be able to ask the court for provision under WESA s. 60 if the will does not make adequate provision for their proper maintenance and support. That claim must generally start within 180 days of the grant.

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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