- Ontario law starts from the principle that a person is generally free to leave their property as they choose, and a validly made will can be changed at any time before death — including…
- Whether you have a realistic claim usually depends on which of these theories fits your facts:
- Regardless of which theory applies, expect to need real evidence, such as: - Written records of the promise — texts, emails, letters, or notes made at the time - What you actually did in…
Hearing "this will be yours one day" from a parent or relative — and then discovering the signed will says something different — is one of the more painful surprises in estate administration. A promised inheritance not in the will does not automatically mean you are owed nothing, but it also does not automatically mean you are owed something. What matters is what kind of promise it was and what you did because of it.
This article walks through why a bare promise usually isn't enough on its own, and what legal theories might actually help.
Why a Promise Alone Rarely Wins
Ontario law starts from the principle that a person is generally free to leave their property as they choose, and a validly made will can be changed at any time before death — including changing their mind about something they once said out loud or put in an earlier draft. A verbal promise, by itself, does not bind someone to leave a particular gift, and it does not override a validly executed later will.
Legal Theories That Might Apply
Whether you have a realistic claim usually depends on which of these theories fits your facts:
| Legal Theory | What You'd Generally Need to Show | Typical Situation |
|---|---|---|
| Proprietary estoppel | A clear promise, that you reasonably relied on it, and that you suffered real detriment as a result | You moved home, gave up a career opportunity, or invested your own money because of the promise |
| Unjust enrichment | You provided value (money, labour, care) that benefited the deceased, with no payment and no other legal explanation for it | You paid for renovations, covered expenses, or provided unpaid services expecting to be repaid through the promised gift |
| A binding contract to leave property | An actual agreement — not just a passing comment — often exchanged for something specific you did or gave up | Rare; usually requires more formality than a family conversation |
What You'll Need to Prove
Regardless of which theory applies, expect to need real evidence, such as:
- Written records of the promise — texts, emails, letters, or notes made at the time
- What you actually did in reliance on it, and when
- Any financial loss, forgone opportunity, or expense you can document
- Witnesses who heard the promise made, ideally more than once and to more than one person
Why Waiting Hurts Your Case
Beyond the emotional cost, delay creates practical problems. Memories fade, witnesses become harder to locate, and records get lost. These claims can also be subject to Ontario's basic limitation period, generally running from when the claim was, or reasonably should have been, discovered — another reason to get advice promptly rather than wait.
What This Doesn't Include
Simply feeling you deserved more, or being surprised by the will's contents, is not on its own a legal claim. That is a different question from actually challenging the will's validity, which requires a specific defect — such as the will-maker lacking capacity, not properly understanding its contents, being subjected to undue influence, or the document not being properly signed and witnessed. Disagreeing with how someone chose to distribute their estate is not, by itself, a recognized ground to challenge it, though it may still be worth a conversation with an estate litigation lawyer about whether any of the theories above genuinely fit your facts.
Frequently asked questions
Does it matter if the promise was made in writing versus just spoken?
Yes, significantly. A written promise is far easier to prove than a verbal one, though verbal promises can still support a claim if there is other strong supporting evidence, such as reliance you can document.
What if I gave up something specific because of the promise, like moving back home to help?
This is often the strongest kind of case, since it goes directly to detrimental reliance — one of the key elements a proprietary estoppel claim needs. Document exactly what you gave up and when.
Can I challenge the will itself instead of pursuing this kind of claim?
Only if there is an actual problem with the will's validity, such as a capacity, undue influence, or execution issue. A validly made will that simply doesn't match an earlier promise is a different situation, addressed through the theories above rather than a validity challenge.
What if the promised item is something small, like a piece of jewellery or a car?
The same legal theories can technically apply, but for lower-value items, the cost of pursuing a claim may outweigh what you'd recover. A lawyer can help you weigh whether it's worth pursuing before you commit to a dispute.
This is a wills & estates question
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