5 Warning Signs Your Will Could Be Contested in Ontario (And How to Fix Them Now)
Most families don't see a will contest coming. One sibling assumed the estate would be split evenly. Another didn't know their parent had signed a new will two years before passing. What started as grief turns into litigation — and by the time it does, it's too late to fix the will that caused it.
The reassuring part is that will contests almost always trace back to a handful of recognizable risk factors. If any of these apply to your current estate plan, it's worth addressing them now, while you still can.
1. You're Leaving Unequal Shares Without Explanation
Leaving different amounts to different children isn't unusual, and it isn't automatically a problem. What is a problem is silence. When beneficiaries are left to guess why, "unfair" quietly becomes "invalid" in their minds — and that's often the emotional starting point for a legal challenge.
The fix: Document your reasoning in a separate memorandum kept with your estate file. You don't have to justify yourself in the will itself, but a clear, calm explanation on record does more to prevent a dispute than almost anything else.
2. Your Will Hasn't Been Updated Since a Major Life Event
Remarriage, a new grandchild, a business sale, a falling-out, a reconciliation — any of these can make an existing will outdated, and in some cases, Ontario law treats certain life events as automatically affecting parts of an existing will. A will that no longer reflects your actual life is far easier to challenge on the basis that it doesn't reflect your true intentions.
The fix: Review your will after every major life event, and at minimum every five years even if nothing has changed.
3. You Signed Your Will Without a Lawyer
Online templates and DIY will kits don't ask the questions that protect an estate: Is there a blended family involved? A beneficiary with a disability who needs a trust rather than a direct inheritance? A witness requirement that was missed? These small, procedural gaps are among the most common reasons a will unravels in court — and they're entirely avoidable with proper guidance.
The fix: Have a wills and estates lawyer review or draft your will, even if you've already used a template. A short consultation can catch issues before they become a family's problem.
4. A Family Member Was Closely Involved in Preparing the Will
If one beneficiary arranged the lawyer, sat in on meetings, or was otherwise heavily involved in shaping the will's contents, that can raise questions of undue influence — even if nothing improper actually happened. Courts pay close attention to the appearance of influence, not just proof of it.
The fix: Meet with your lawyer independently, without the involved family member present, and make sure that's documented in your file.
5. There Are Signs of Memory or Cognitive Change
If you or a loved one has experienced memory changes, a new diagnosis, or is simply at an age where capacity could later be questioned, this is one of the most contested grounds in Ontario will disputes — and one of the easiest to protect against in advance.
The fix: A capacity assessment completed at the time the will is signed, and documented in the file, is one of the strongest safeguards available. It's a conversation worth having proactively, not after a challenge has already started.
The Bigger Picture
None of these five signs mean your will is doomed to be contested. They mean there's a gap between where your plan is today and where it could be with a bit of attention. Every one of them is fixable — usually in a single meeting with a wills and estates lawyer.
For a full walkthrough of what makes a will vulnerable in Ontario, who can legally contest one, and the complete list of steps to protect your estate, read our complete guide:
This article provides general information about Ontario estate law and is not a substitute for legal advice specific to your situation.