What Is “Legal Capacity” In Estates Litigation

If you are looking to challenge, as an example, your parent’s Will, you must understand the importance of “capacity” in estate litigation.

Legal capacity is not the same as intelligence, age, or general health. A person can be elderly, forgetful, or even diagnosed with a cognitive condition and still have legal capacity, as long as they understood the specific decision they were making at the specific moment they made it.

Capacity is also decision-specific and time-specific. 

This means your parent may have had capacity to sign a birthday card but not capacity to execute a will on the same day. It also means capacity can fluctuate: a person with dementia may have a period of clarity in the morning but lack capacity by the afternoon.

The Courts in Ontario look at the following to determine the validity of a Will:

• The nature of making a will — that they were creating a document that would distribute their property after death.
• The extent of their property — a general understanding of what they owned (not a precise accounting).
• The natural objects of their bounty — who their close family members and dependants were.
• How the will affects those people — that certain people would receive more, less, or nothing at all.

If your parent could not satisfy one or more of these elements at the time of signing, their will may be invalid.

Wills are not the only documents that can be challenged. Each type of document has its own capacity standard:

Power of Attorney for Property or Personal Care: Your parent must have understood the nature of the document, what authority they were granting, and to whom. Ontario’s Substitute Decisions Act, 1992 sets out the specific capacity requirements.

Transfer of Real Property: To transfer a home or other real estate, your parent must have understood the nature of the transaction, the property involved, and the consequences of the transfer.

Gifts: For a significant gift made during a person’s lifetime to be valid, the donor must have understood the nature and effect of what they were giving away.

Medical records are typically the backbone of a capacity challenge. Relevant records include:

• Hospital admission and discharge summaries.
• Physician and specialist notes from the months surrounding the signing.
• Cognitive assessments such as the Mini-Mental State Examination (MMSE) or Montreal Cognitive Assessment (MoCA).
• Prescribed medications and dosages — certain drugs significantly impair cognition.
• Any formal diagnosis of dementia, Alzheimer’s, delirium, stroke, or psychiatric condition.

Even if there is no formal diagnosis, clinical notes describing confusion, disorientation, memory loss, or inability to recognize family members can be highly persuasive.

In Ontario, a lawyer who prepares a will or other legal document has a professional obligation to assess the client’s capacity before proceeding. Courts will look closely at:

• Did the lawyer meet with your parent privately, without the beneficiary or power of attorney present?
• Did the lawyer take notes on their capacity assessment?
• Did your parent give instructions independently, or did someone else relay them?
• Did the lawyer have any concerns at the time?

People who spent time with your parent around the time of signing can provide critical evidence:

• Caregivers and personal support workers who observed daily functioning.
• Neighbours who noticed changes in behaviour.
• Friends who saw your parent become confused, repetitive, or easily influenced.
• Family members who observed the deterioration firsthand.

Courts are aware that family testimony can be self-interested, but corroborated accounts from multiple independent witnesses carry significant weight.

Sometimes the document contains internal clues that suggest capacity was compromised:

• The will omits close family members your parent would never have intentionally excluded.
• Beneficiaries are named who your parent did not know well or had a strained relationship with.
• The document was signed very shortly before death or during a known medical crisis.
• The terms are dramatically different from prior wills without any apparent explanation.

In most contested capacity cases, both sides will retain expert witnesses. A geriatric psychiatrist or certified capacity assessor can review all available records and provide an expert opinion on whether your parent likely had capacity at the relevant time.

Contact us at 416.901.9984 or info@pintoshekib.ca for a confidential consultation.