Being unhappy with a will is not a ground to challenge it. Ontario courts set wills aside for four reasons: the testator lacked capacity, someone coerced them, the document was not signed and witnessed properly, or the testator did not know and approve what it said.
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Testamentary capacity is judged at the moment the will was signed. The testator had to understand that they were making a will and what it does, know in general terms what they owned, and appreciate the claims of people they might be expected to provide for. No disorder of the mind could have distorted that judgment. A dementia diagnosis does not decide the question by itself — capacity fluctuates. Medical records and the drafting lawyer's notes usually settle it.
Undue influence means coercion, not persuasion. Advice, family pressure, even emotional blackmail short of overbearing the testator's own will are not enough — the question is whether the document records someone else's wishes. The person challenging carries the burden. These claims succeed on patterns: an isolated elderly parent, one adult child controlling access and appointments, a sudden change late in life, a new lawyer nobody else knew about.
A formal will under the <a href="https://www.ontario.ca/laws/statute/90s26">Succession Law Reform Act</a> must be in writing, signed by the testator at its end, and witnessed by two people who were both present when the testator signed and who then signed themselves. A holograph will — wholly in the testator's own handwriting and signed — needs no witnesses. A witness who takes a gift under the will loses the gift, though the will survives, unless the court is satisfied that neither the witness nor the witness's spouse exercised any improper or undue influence on the testator. Ontario courts now also have power to validate a document that fails the formalities but genuinely records testamentary intentions.
Knowledge and approval is the quiet ground that does most of the work. Where suspicious circumstances surround the will — a beneficiary arranged it, gave the instructions, or drove the testator to the appointment — the person propounding the will must prove the testator knew and approved its contents. Fraud and forgery are separate grounds and are rarer, because each requires proof of a deliberate lie or a faked signature.
You do not sue a will. If nobody has been appointed yet, you file a notice of objection with the Superior Court in the county or district where the deceased lived, and no certificate of appointment of estate trustee can issue without notice to you. If a certificate has already issued, you apply to have it returned and the appointment suspended. The <a href="https://www.ontario.ca/laws/statute/90e21">Estates Act</a> governs who is entitled to be appointed in the first place.
Nothing else happens until the court makes an order giving directions. That order names the parties, defines the issues, sets a documents and discovery timetable, and deals with who funds the litigation in the meantime. In some Ontario jurisdictions estate matters go to mandatory mediation before any hearing. Getting the order giving directions right shapes the whole case. It is not a formality.
Then you gather evidence you do not yet have. The court can order the drafting lawyer to produce the complete file — instructions, notes, drafts, observations on capacity — and can order production of medical and pharmacy records. Bank statements often show the pattern better than any witness. Many cases settle once the solicitor's file has been read, because the file either supports the will or it does not.
There is no clean statutory deadline for a will challenge, which is exactly why people lose them. An appointed trustee can sell assets and distribute the proceeds. Move before the estate has been paid out and before memories and records go stale. If you already know a will is coming that you intend to question, say so in writing to the trustee early.
The old assumption that the estate pays everyone's costs is gone. Ontario courts start from the ordinary rule that the losing party pays, and depart from it where the testator's own conduct or the state of the will caused the litigation, or where there were reasonable grounds to question the will. A speculative challenge can leave you paying two sets of legal bills out of your own pocket.
Run the arithmetic before you file. If the will is set aside, the previous will governs. If there is no previous will, the estate is distributed on intestacy under the <a href="https://www.ontario.ca/laws/statute/90s26">Succession Law Reform Act</a>, and that sometimes leaves the challenger with less than the will gave them. Work out what winning actually pays before you spend anything on getting there.
A will challenge is also not the only route. A dependant can claim <a href="/dependant-support-claim-lawyer-ontario">support out of the estate</a>. A married spouse can elect for an equalization payment under the <a href="https://www.ontario.ca/laws/statute/90f03">Family Law Act</a> instead of taking under the will, and that election must be made within six months of death. Beneficiary designations on insurance and registered plans are attacked separately again.
The cheapest protection against all of this is a will drafted properly in the first place — the testator seen alone, capacity noted at the time, the reasons recorded. See our <a href="/pricing">pricing</a> or the <a href="/wills-estates">wills and estates overview</a> for how we handle drafting and estate disputes.
No. Ontario adults are free to leave their property as they choose, and disappointment is not a ground. You have to show a defect: the testator lacked capacity, was coerced, did not know and approve the contents, or the will was not signed and witnessed properly. Unfairness only matters on its own if you separately qualify as a dependant claiming support.
No single deadline is written into the wills legislation, and that is a trap rather than a comfort. Once an estate trustee is appointed, assets can be sold and distributed, and a challenge brought after distribution may be worth nothing. File a notice of objection as soon as you suspect a problem, because it stops a certificate issuing without notice to you.
Yes, if it is a true holograph will: entirely in the deceased's own handwriting and signed by them. No witnesses are needed. A part-typed, part-handwritten document usually fails as a holograph will, and a printed form with handwritten blanks is the version that most often ends up in court. Handwriting evidence and the surrounding circumstances decide these cases.
A notice of objection prevents a certificate of appointment from issuing without notice to you, and the court can suspend an appointment already made. A trustee who distributes while a challenge is live risks personal liability. The court can still authorize necessary spending in the meantime, such as funeral expenses, mortgage payments and insurance on a house standing empty.
Usually the losing side. Courts depart from that where the testator caused the confusion, or where there were reasonable grounds to question the will, and in those cases costs may come out of the estate. Do not assume the estate funds your challenge. Ask your lawyer for a written costs assessment before you file anything.
Open your file tonight — a licensed Ontario lawyer will confirm everything with you by tomorrow.