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Parenting Time and Decision-Making for Unmarried Parents in Ontario

How parenting time and decision-making work for common-law parents in Ontario, what a cohabitation agreement can't cover, and how child support fits in.

Family Law4 min readTSLBy the Treadstone Law Team · OntarioUpdated November 13, 2026
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Key takeaways
  • Every parent must support their child to the extent they are able, whether or not the parents were ever married.
  • A cohabitation agreement cannot deal with decision-making responsibility or parenting time for the children.
  • A court may disregard parts of a domestic contract about children if that is in the child's best interests.

If you and your partner were never married and you are separating, you may be searching for the word custody. Many people still use it, but the terms in Ontario's Family Law Act are decision-making responsibility and parenting time.

This article explains how being unmarried affects parenting issues, what a cohabitation agreement can and cannot say about children, and how child support fits in. How a particular family's schedule is set depends on the facts, so a lawyer can confirm what applies to you.

Being unmarried does not change your role as a parent

Property rules and parenting rules work very differently for common-law couples. Property rules for married spouses do not apply to unmarried partners. A parent's responsibility to a child is different: every parent must support their child to the extent they are able, whether or not the parents were ever married.

Whether someone is a parent of a child is set out in s. 4 of the Children's Law Reform Act. If parentage is disputed or unclear, get legal advice early.

What the words mean

These are separate questions. Parents can agree on a schedule without agreeing on who decides everything, and the reverse is also true.

What a cohabitation agreement can and cannot cover

Two unmarried people who are cohabiting, or intend to, may make a cohabitation agreement about their rights and obligations, including property and support. To be enforceable, it must be in writing, signed by the parties and witnessed.

For children, the limits matter. An agreement may deal with the right to direct the children's education and moral training, but it cannot deal with decision-making responsibility or parenting time.

Even where an agreement does cover education or moral training, a court deciding those issues, or decision-making responsibility or parenting time, may disregard a provision of a domestic contract on that matter if that is in the child's best interests. In short, a signed agreement does not lock in how children are looked after.

Child support and spousal support are separate questions

Every parent must support their child to the extent they are able, whether or not the parents were ever married, and a cohabitation agreement cannot deal with parenting time for the children. A court may disregard a child support provision in a domestic contract if it is unreasonable having regard to the child support guidelines and any other child support provision in the contract.

Spousal support is a different claim. For support, unmarried partners can be spouses if they cohabited continuously for not less than three years. They are also spouses, however long they lived together, if they cohabited in a relationship of some permanence and are the parents of a child as set out in s. 4 of the Children's Law Reform Act.

What to do next

Frequently asked questions

Do unmarried parents have the same duty to support their children as married parents?

Yes. Every parent must support their child to the extent they are able, whether or not the parents were ever married.

Can our cohabitation agreement set parenting time?

No. A cohabitation agreement cannot deal with decision-making responsibility or parenting time for the children. It may deal with the right to direct the children's education and moral training.

Can a court ignore what we agreed about the children?

Sometimes. A court may disregard a provision of a domestic contract about education, moral training, decision-making responsibility or parenting time if doing so is in the child's best interests. It may also disregard an unreasonable child support provision.

Does having a child together affect spousal support?

It can. Unmarried partners who cohabited in a relationship of some permanence and are parents of a child under s. 4 of the Children's Law Reform Act are spouses for support purposes, however long they lived together. Whether support is owed depends on need and ability to pay.

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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