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№ 22 Wills & Estates

Can an Adult Child Be Disinherited in Ontario?

Learn when a child left out of a parent's will in Ontario may still have a claim: support for dependants, will challenges, and joint accounts.

Wills & Estates4 min readTSLBy the Treadstone Law Team · OntarioUpdated November 13, 2026
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Key takeaways
  • Being left out of a will does not automatically give a claim, but a child who was being supported may ask the court for support within six months after probate.
  • A will challenge needs some evidence that the will's validity is in question, and it faces time limits.
  • Assets that pass outside the will, such as joint accounts, may still be part of the picture.

Finding out that a parent left you out of their will is painful, and it raises a practical question: is there anything you can do? Sometimes the answer is no, and sometimes there are real options.

This article walks through the main routes in Ontario: a support claim as a dependant, a challenge to the will itself, and a look at assets that pass outside the will. Each depends heavily on the facts, so a lawyer should review your situation early.

Being left out is not the same as having a claim

A parent can generally decide who receives their property, and a child who is left out must point to a legal reason to challenge that.

If there is no valid will at all, the rules for an intestacy decide who inherits instead, and children are among those who can share. So the first question is whether there is a valid will.

Support claims by dependants

The court can order support from the estate where the deceased did not make adequate provision for a dependant. A dependant is a spouse, parent, child or sibling the deceased was supporting. An adult child who was not being supported may not fit this definition, so the facts of your relationship matter.

The application must be made within six months after the grant of probate or administration. The court may allow an application at any time as to any part of the estate not yet distributed. For a support claim, non-estate assets are treated as part of the estate, including joint accounts, property held in joint tenancy, life insurance owned by the deceased and amounts payable under a beneficiary designation.

Challenging the will itself

Anyone who appears to have a financial interest in the estate may file a notice of objection (Form 75.1) at any time before a certificate of appointment of estate trustee is issued. A notice of objection expires three years after it is filed. The applicant serves a notice to objector, and if the objector does not serve a notice of appearance within 20 days, the application goes ahead as if no objection had been filed.

Before a court will order proof of a will, the person challenging must meet a minimal evidentiary threshold: some evidence which, if accepted, would call the will's validity into question. Common grounds include lack of capacity and undue influence.

Assets outside the will

Some assets pass outside the estate, by joint ownership with survivorship or to a designated beneficiary. A person may designate a beneficiary of a plan such as an RRSP, RRIF or pension by a signed instrument or by will.

A gratuitous transfer from a parent to an adult child, including into a joint account, is presumed to be held on a resulting trust for the parent's estate, and that presumption can be rebutted by evidence that the parent intended a gift. For a minor child, the starting point is the presumption of advancement, which is a gift. Courts weigh later statements of intention, the wording of the bank documents, who controlled and used the funds, any power of attorney, and how the account was treated for tax.

What to do next

Frequently asked questions

Is a parent allowed to leave an adult child out of a will?

Generally a person decides who receives their property, so being left out does not by itself create a claim. A child may still have options, such as a support claim as a dependant or a challenge to the will's validity.

How long do I have to ask for support from the estate?

The application must be made within six months after the grant of probate or administration. The court may allow it later as to any part of the estate not yet distributed.

What do I need to challenge a will?

You must show some evidence which, if accepted, would call the will's validity into question. A lawyer can assess whether grounds such as capacity or undue influence fit your facts.

Does a joint account with my parent belong to me or to the estate?

It depends. A gratuitous transfer from a parent to an adult child, including into a joint account, is presumed to be held for the parent's estate unless evidence shows the parent intended a gift. Courts weigh several kinds of evidence, so the bank documents alone do not decide it.

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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