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Left Out of a Will in Ontario? What Your Options Are

Discovered you were left out of a parent’s or relative’s will in Ontario? Here are the realistic options to weigh before you decide how to respond.

Wills & Estates5 min readTSLBy the Treadstone Law team · OntarioUpdated 2026-07
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Key takeaways
  • Before considering any legal step, confirm what actually happened.
  • There are many legitimate reasons a will-maker excludes someone: earlier financial support already given, estrangement, a genuine wish to leave everything to a spouse or another child,…
  • A dependant’s support claim If you were financially dependent on the person who died, for example as their spouse, parent, child, or a sibling they were supporting, Ontario’s Succession…

Finding out you were left out of a will, especially a parent’s or close family member’s, is disorienting even when you suspected it might happen. Ontario law gives will-makers broad freedom to leave their property to whomever they choose, which means being excluded is not, by itself, unfair in a legal sense. But there are situations where the law gives an excluded person real options.

The right response depends on why you think you were left out, and what you actually want: an explanation, a share of the estate, or simply peace of mind that nothing improper happened.

Step One: Get the Facts Before You Decide Anything

Before considering any legal step, confirm what actually happened.

Why People Get Left Out — Not Always a Legal Problem

There are many legitimate reasons a will-maker excludes someone: earlier financial support already given, estrangement, a genuine wish to leave everything to a spouse or another child, or simply personal preference. Ontario law generally respects a competent adult’s freedom to decide who inherits their property. Disagreeing with that decision is not, on its own, a legal ground to change it.

When the Law Gives You a Real Option

1. A dependant’s support claim

If you were financially dependent on the person who died, for example as their spouse, parent, child, or a sibling they were supporting, Ontario’s Succession Law Reform Act allows certain dependants to apply to court for support from the estate, regardless of what the will says. This is a claim for support, not necessarily a claim to overturn the will itself, and it runs on a tight timeline once the estate is opened, so speak with a lawyer promptly if this might apply to you.

2. A will challenge

If you have a genuine reason to believe the will itself is invalid, because the will-maker lacked the mental capacity to understand what they were signing, was pressured or unduly influenced by someone else, did not know or approve of the document’s contents, or the will was not properly signed and witnessed, you may have grounds to challenge the will’s validity. Simply disagreeing with how the estate was divided is not enough on its own.

3. A negotiated resolution

Many estate disputes are resolved without going to court at all. If family members are willing to talk, a lawyer can help negotiate a resolution that avoids the cost, delay, and family strain of formal litigation.

4. Accepting the outcome

Sometimes, after reviewing the facts, the honest answer is that the will reflects a valid, deliberate choice with no legal basis to challenge. That is a difficult thing to accept, but it is often the realistic conclusion, and knowing that clearly can bring its own kind of closure.

A Word on Timing

Several of the options above are time-sensitive. Ontario law sets limitation periods for bringing claims related to an estate, and courts have only limited discretion to extend them once they pass. Do not wait to get advice simply because the estate has not yet been fully administered; by the time it is, some options may already be closed off.

Frequently asked questions

Does every child have a right to inherit from a parent in Ontario?

No. Ontario law does not require a parent to leave anything to an adult, financially independent child. A dependant’s support claim is only available to people who meet the legal definition of a dependant, which generally involves an existing support relationship, not simply a family connection.

What if I think my sibling pressured our parent into changing the will?

That could potentially support a will challenge on the grounds of undue influence, but it requires more than suspicion; it takes evidence about the circumstances surrounding how and when the will was made. A lawyer can help you assess whether what you know amounts to a genuine legal claim.

Can I ask to see the will before deciding what to do?

Yes. If you would have inherited had there been no will, or if you are named in an earlier will, you are generally entitled to a copy after death, even if you were left out of the final version.

Will challenging the will damage my relationship with the rest of the family?

That is a real and valid concern, and only you can weigh it against what is at stake. A lawyer can also help you explore negotiated options that may resolve the issue with less conflict than formal litigation.

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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