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Disinherited Child in Ontario: Do You Have Any Rights?

Learn whether an Ontario child cut out of a will has any right to a share, when dependant support applies, and what other options exist.

Wills & Estates5 min readTSLBy the Treadstone Law Team · OntarioUpdated November 6, 2026
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Key takeaways
  • Ontario law does not give an adult, independent child an automatic right to a share of a parent's estate.
  • A child who was financially supported by the deceased may be able to apply for dependant support, but a six-month deadline usually applies.
  • A will can also be challenged on grounds such as capacity or undue influence, and lifetime transfers can sometimes be pulled back into the estate.

Finding out that a parent left you little or nothing is painful, and it is natural to ask whether the law lets you fight it. The honest answer is that Ontario gives parents a lot of freedom over who receives their property, but that freedom has limits.

This article explains the main routes a disinherited child may have: a dependant support claim, a challenge to the will itself, and a claim about property that moved before death. Every situation turns on its facts, so treat this as a map and not a verdict.

No automatic share for an adult child

The Court of Appeal for Ontario has held that there is no statutory duty on a competent person making a will to provide for an adult, independent child. Ontario law lets people exclude children who are not dependants.

Put simply, being a child is not enough. Adult independent children are not entitled to dependant's relief under the Succession Law Reform Act (SLRA) just because they were left out. The courts also generally will not go behind a clear, unconditional choice of beneficiaries, although they will void conditions in a will that offend public policy.

Dependant support: the main statutory route

If a deceased person, with or without a will, did not make adequate provision for the proper support of their dependants, the court may order that adequate provision be made out of the estate. A child can claim only if they fit the legal definition of dependant, which means the deceased was providing support, or was under a legal obligation to provide support, immediately before death.

That can include an adult child who relied on the parent, but it is a question of the facts. When setting the amount and length of support, the court considers all the circumstances, including the dependant's age, health, likely future assets and means, and the claims of other dependants.

Challenging the will itself

A different route is to argue that the will is not valid. The person relying on the will must prove it was properly signed, that the deceased knew and approved its contents, and that the deceased had testamentary capacity. Once proper signing is shown, the law presumes knowledge, approval and capacity, and those challenging must put forward evidence. If they raise suspicious circumstances, the burden goes back to the person relying on the will.

Testamentary capacity means a sound disposing mind. The person must understand the nature and effect of the will, recall the nature and extent of their property, understand what they are giving, and remember the people they might be expected to benefit.

Undue influence is treated differently. The burden of proving it stays with the people attacking the will, and suspicious circumstances do not shift it. It means outright and overpowering coercion of the person making the will, and it must be proved on a balance of probabilities. The presumption of undue influence that can help in lifetime transactions does not apply to wills.

Property that moved before death

Sometimes a parent put an account or property into joint names with one child. When a parent gratuitously transfers property to an adult child, including into joint names, the law presumes the child holds it for the parent's estate, and the child bears the burden of rebutting that presumption. The question is the parent's actual intention at the time of the transfer, and a court may also consider the parent's conduct afterwards.

Even when the presumption is rebutted, the survivor does not always keep everything. In one Court of Appeal case, the presumption was rebutted, yet the sons were found to hold the joint-account funds under an obligation to share them equally among all five children. Different rules apply between spouses.

For a dependant support claim specifically, joint accounts and joint-tenancy property are treated as passing at death, but they count only to the extent the money or consideration came from the deceased, and the dependant must prove that.

What to do next

Frequently asked questions

Can a parent legally leave their adult child nothing in Ontario?

Generally yes. There is no statutory duty on a competent person to provide in a will for an adult, independent child. The exceptions are a child who qualifies as a dependant, or a will that is invalid.

How long do I have to claim support from an estate?

An application for dependant support generally cannot be made more than six months after letters probate or letters of administration are granted. A court may allow a late claim, but only against the part of the estate not yet distributed.

Does a signed waiver end my claim?

Not necessarily. A court can make a support order even if the dependant signed an agreement or waiver saying otherwise. Whether it should depends on the facts.

Is it enough to say my sibling pressured our parent?

No. Undue influence means overpowering coercion and the person alleging it must prove it. You get no presumption in your favour when challenging a will.

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. Ontario 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 licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

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