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Divorce When a Spouse Lacks Capacity or Has Dementia in Ontario

Can you divorce in Ontario if your spouse has dementia or lacks capacity? Learn the grounds, how a case proceeds, support and property basics.

Family Law5 min readTSLBy the Treadstone Law Team · OntarioUpdated November 6, 2026
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Key takeaways
  • The only ground for divorce in Ontario is breakdown of the marriage, and the other spouse does not have to consent.
  • When a spouse cannot take part in a case, how the case is handled depends on the facts, and a lawyer can confirm how that works in your situation.
  • Property, support and the matrimonial home are dealt with under separate rules, and a claim for equalization has deadlines.

Caring for a spouse with dementia or another condition that affects capacity is hard enough. If the marriage has also broken down, you may wonder whether a divorce is even possible when your spouse cannot understand or take part in a court case.

This article explains the general Ontario rules that apply, and where capacity changes how a case is handled. Capacity is a question of fact and law, so a lawyer should confirm how it applies to you before you take any step.

Do you need your spouse's consent?

No. The only ground for divorce is breakdown of the marriage, the other spouse does not have to consent, and no minimum length of marriage is required. Breakdown is usually proved by living separate and apart for at least one year before the court decides the case, and the spouses must have been living apart when the case started.

Spouses count as living apart for any period they lived apart while either one intended to live separately, so only one spouse needs to intend the separation. Whether a spouse who lives in a care home and a spouse who lives at home are living separate and apart in the legal sense depends on the facts, and a lawyer can advise.

The court must also be satisfied there is no possibility the spouses will reconcile. If reconciliation seems possible, it can adjourn the case.

When your spouse cannot take part in the case

If your spouse cannot understand or direct a court case, it is worth asking a lawyer early how the case can be handled. How a case proceeds in that situation depends on the facts, so it is worth confirming with a lawyer.

The family court rules also give special treatment to a "special party". For example, an application, answer or reply of a special party can be withdrawn only with the court's permission. Who counts as a special party, who may act for your spouse, and what steps are needed depend on the facts, so confirm them with a lawyer before you file.

How the court case proceeds

Only the Superior Court of Justice, including its Family Court branch, deals with divorce and property claims. Either spouse may start a divorce by an application naming the other spouse as respondent. A joint application is also possible, but in a joint application the divorce and any other order can be made only with both spouses' consent. Whether a spouse who lacks capacity can give that consent depends on the facts, so it is worth confirming with a lawyer.

A respondent served in Canada or the US has 30 days to serve and file an answer, and someone 18 or older, other than the applicant, must serve the documents. If no answer is filed, an uncontested divorce is decided on paper, and the evidence is an affidavit (Form 36). The court also needs the marriage certificate and a report from the Central Registry of Divorce Proceedings.

If any children of the marriage are involved, the court must be satisfied that reasonable arrangements have been made for their support, or it delays the divorce. Where appropriate, parties must also try to resolve their issues through a family dispute resolution process such as mediation.

Support, property and the home

A divorce does not only end the marriage. Money questions often matter more, and they follow separate rules.

If you divorce, gifts to a former spouse in your will and their appointment as executor are revoked unless the will shows a contrary intention. Because your spouse may be unable to update their own documents, ask a lawyer how to handle this.

What to do next

Frequently asked questions

Can I divorce my spouse if they have dementia?

The law does not require your spouse's consent, and the only ground is breakdown of the marriage. How the case is run when a spouse cannot take part depends on the facts, so a lawyer should confirm the steps.

Does my spouse need to agree to a joint application?

Yes. In a joint application, the divorce and any other order can be made only with both spouses' consent. A spouse who lacks capacity may not be able to give that consent in the ordinary way.

Will I have to go to court?

An uncontested divorce is decided on paper, and rule 36 does not require anyone to attend in person. If an answer is filed, a judge must hold at least one conference, subject to exceptions.

Will a divorce affect my spouse's care?

Divorce deals with the marriage, support and property, and the court considers each spouse's means and needs in setting support. How it affects care arrangements depends on the facts, so raise it with a lawyer.

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Ontario laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

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