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Contesting a will in Ontario means formally challenging whether a will is legally valid. Courts do not set aside a will lightly, but there are established legal grounds on which a challenge can succeed, and they arise more often than people expect.
The most common basis for contesting a will is lack of testamentary capacity, meaning the person who made the will did not have the mental capacity required by law at the time it was signed. A valid will requires that the person understand what a will is, know the nature and extent of their property, recognize who their natural heirs are, and be able to weigh those factors without external pressure distorting their judgment. Where cognitive decline, dementia, or acute illness was present at the time of signing, capacity may be in question.
A will can also be challenged based on undue influence, where another person, often a caregiver, family member, or beneficiary, exerted pressure that overrode the testator’s free will. Proving undue influence requires evidence of the relationship and the circumstances surrounding the will’s creation. Suspicious circumstances, such as a sudden change in instructions shortly before death or the exclusion of close family members without apparent reason, can support this type of challenge.
Grounds for contesting a will in Ontario include:
Time matters in will challenges. Estate administration can move quickly once probate is granted, and assets can be distributed before a challenge is brought. If you believe a will is invalid, getting legal advice promptly protects your ability to act.
Not every estate dispute involves contesting the will itself. Many disputes arise between beneficiaries, or between beneficiaries and the estate trustee, over how the estate is being administered. These matters can be just as financially significant and just as legally complex as a formal will challenge.
An estate dispute lawyer helps clients navigate the full range of conflicts that arise after a death, including disputes over the valuation and distribution of specific assets, disagreements about the sale of estate property, claims that an estate trustee is acting improperly or failing to administer the estate in accordance with its terms, and challenges to the conduct of an executor who has a conflict of interest.
Ontario law gives the court significant authority over estate administration. Where an estate trustee has mismanaged assets, delayed distribution without justification, favoured certain beneficiaries, or failed to account properly for estate funds, the court can compel accounting, remove the trustee, or order compensation for losses caused by the trustee’s conduct.
An estate dispute lawyer can assist with:
Natalia Denchik works with both beneficiaries and estate trustees, advising each on their legal rights and obligations and helping resolve disputes through negotiation where possible, and through court proceedings where necessary.
An inheritance dispute arises when someone believes they have been unfairly treated in the distribution of an estate. This may be a family member who was excluded from a will without explanation, a dependent who was not provided adequate support, or a spouse whose entitlement under Ontario law was not honoured in the will’s terms.
Ontario’s Succession Law Reform Act gives dependants of a deceased person the right to apply to the court for support from the estate where the will fails to make adequate provision for them. A dependant includes a spouse, parent, child, or sibling who was financially dependent on the deceased at the time of death. This type of claim does not require proving the will is invalid. It is a separate statutory right to seek fair provision from an estate regardless of what the will says.
Spouses of a deceased person also have the right to elect between taking what the will provides and taking their equalization entitlement under family property law. Where a spouse was left less under the will than they would receive under an equalization claim, this election can result in a significantly larger share of the estate. The election must be made within six months of the grant of probate, making early legal advice essential.
Inheritance dispute help is available for:
Inheritance disputes are often made more difficult by grief, family dynamics, and the urgency that comes with estate administration timelines. Natalia Denchik provides direct, practical guidance from the outset so you understand what you are entitled to, what can realistically be pursued, and how to move forward.
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13025 Yonge Street, Unit #201E,
Richmond Hill, ON
L4E 1A4
Fax: 416-900-5168