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№ 22 Wills & Estates

Undue Influence by a Caregiver or Adult Child on a BC Will

Learn how British Columbia courts approach claims that a caregiver or adult child unduly influenced a parent's will, and who must prove what.

Wills & Estates4 min readTSLBy the Treadstone Law Team · British ColumbiaUpdated November 13, 2026
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Key takeaways
  • Under WESA section 52, if a challenger shows the other person was in a position of potential dependence or domination, the defender must prove no undue influence was exercised.
  • Without that showing, the person alleging undue influence or fraud generally bears the burden of proving it.
  • A disinherited spouse or child may have a separate claim for adequate maintenance and support.

It is common for one child or a paid caregiver to be closest to an older parent. If the will then favours that person, siblings and other relatives may suspect the parent was pressured or took advice from someone they depended on.

Closeness alone is not wrongdoing. This article explains how BC law structures an undue influence claim, who has to prove what, and what other options exist. A lawyer can tell you how it applies to your facts.

This article covers the law of British Columbia.

What undue influence means

In plain terms, undue influence means a will reflects someone else's pressure or domination rather than the will-maker's own free decision. Probate checks that a will was made without fraud or undue influence, and a will that passes these checks is described as valid. The government guide notes that this does not replace the advice of a lawyer.

Questions of undue influence are decided by the Supreme Court in a proceeding to prove the will in solemn form.

How section 52 shifts the burden

WESA section 52 deals with undue influence. 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 goes first. They must show 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.

StepWhat happens
Challenger's showingShows a position of potential dependence or domination, used to influence the will
Onus shiftsThe defender must prove no undue influence was exercised
If the showing is not madeThe person alleging undue influence or fraud bears the burden of proving it

Caregivers and adult children

A caregiver or an adult child who handled a parent's daily life may or may not be in a position of potential dependence or domination, and that depends on the facts.

Under section 52 of the Wills, Estates and Succession Act, the onus of proving undue influence shifts only once the challenger has shown a position of potential dependence or domination. Without that showing, the person alleging undue influence or fraud bears the burden of proving it.

Where suspicious circumstances relate to mental capacity, the person propounding the will reassumes the burden of establishing capacity. Suspicious circumstances do no more than rebut the presumption of capacity and of knowledge and approval, and a person alleging undue influence or fraud generally still has to prove it, except where section 52 shifts the onus.

How this applies to a particular caregiver or adult child depends on your situation, so it is worth confirming with a lawyer.

Other routes and timing

The deadline for a validity challenge itself is a point to confirm with a lawyer promptly. The 180-day period applies to wills variation claims, which are different from validity challenges.

What to do next

Frequently asked questions

Is a caregiver who inherits automatically guilty of undue influence?

No. A challenger must first show the other person was in a position of potential dependence or domination and that the position was used to influence the will. Only then does the onus move to the defender.

Who has to prove undue influence?

Generally the person alleging it. Where section 52 applies, once the challenger shows a position of potential dependence or domination, the defender must prove no undue influence was exercised.

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

A spouse or child may be able to claim that the will does not make adequate provision for proper maintenance and support. A wills variation proceeding under Division 6 of Part 4 must be commenced within 180 days from the date the representation grant is issued in British Columbia, and this is a different claim from a validity challenge.

Can I remove an executor I think was involved?

A person with an interest in an estate may apply to the court to remove or pass over a personal representative. Whether that is appropriate 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. 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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