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Form 35.1 Affidavit About Parenting in Ontario: How to Complete It

Starting a parenting case in Ontario? Learn when Form 35.1 is required, who completes which parts, related deadlines and common mistakes to avoid.

Family Law4 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • Form 35.1 is filed with Form 8 (Application) to start a parenting case.
  • A parent completes Part A only, while a non-parent completes Parts A and B.
  • Non-parent applicants also need a Children's Aid Society report and a police record check, with firm deadlines.
  • Form 35.1 is also needed from each party on a consent motion to change parenting terms.

If you are asking an Ontario court to decide parenting time, decision-making responsibility or contact, you will file an affidavit on Form 35.1 along with your application. It is a sworn document, so accuracy and completeness matter.

This article explains when the form is needed, who fills in which parts, the related paperwork, and practical ways to avoid common mistakes. It does not replace the form's own instructions, and a lawyer can review your draft before you swear it.

What Form 35.1 is and when it is used

Ontario lists two forms to start a parenting case: Form 8 (Application) and Form 35.1 (Affidavit). The affidavit supplies the court with sworn information about the child and the circumstances.

The form also comes up outside a new application. To change a final order or a filed agreement on consent, each party must file a commissioned Form 35.1 for changes to decision-making, parenting time or contact. When a family arbitration award on parenting is filed in court, the documents include a Form 35.1 affidavit.

Who completes which parts

Who you areWhat you completeExtra documents
A parentPart A onlyForm 8 with the affidavit
A non-parent, such as a grandparent or other relativeParts A and BChildren's Aid Society Report on Records and a police record check
Anyone, where child protection information appliesAs aboveForm 35.1A added

If you are unsure whether you count as a parent for this purpose, get advice before filing, because the answer decides which parts and supporting documents you need.

Extra deadlines for non-parent applicants

If you are not a parent, the police record check must be served and filed within 10 days of receipt, and an existing check can be used if it was completed within 60 days before the application. A CAS report is returned to the court within 30 days, and a motion to seal CAS records must be filed within 20 days of the court receiving the last CAS report.

These timelines are short, so request the check and report early and keep track of the dates.

Thinking about what the court looks at

Whatever the form asks, the court makes parenting decisions based only on the child's best interests, giving primary consideration to the child's physical, emotional and psychological safety, security and well-being. The factors include the child's needs and stability, relationships with each parent, each parent's willingness to support the child's relationship with the other, history of care, and cultural, linguistic, religious and spiritual upbringing.

The court must also consider any family violence and its impact, and any civil or criminal proceeding, order, condition or measure relevant to the child's safety. If any of this applies to your family, it is worth discussing with a lawyer how to set it out accurately and clearly.

Common mistakes and how to avoid them

Take the affidavit seriously because it is sworn. A lawyer or the court's Family Law Information Centre can point you to the correct forms and instructions.

What to do next

If a child may be in danger or at risk of being taken out of the country, call the police right away.

Frequently asked questions

Do I file Form 35.1 with my application?

Yes. Ontario lists Form 8 (Application) and Form 35.1 (Affidavit) as the forms to start a parenting case.

I am a parent. Which part do I fill out?

A parent completes Part A only. A non-parent completes Parts A and B.

Do I need Form 35.1 to change an existing order on consent?

Yes. Each party must file a commissioned Form 35.1 for changes to decision-making, parenting time or contact, along with Form 15C and other documents.

What is Form 35.1A?

Form 35.1A is added if child protection information applies. A lawyer can confirm whether it applies in your situation.

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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