To reopen a final parenting order in Ontario, your ex-partner must legally prove a “material change in circumstances.” If they file a Motion to Change based on false pretenses, you can file a Form 15B Response to ask the judge to dismiss the case and order your ex to pay your legal costs.
Defending Your Ontario Parenting Order Against Frivolous Claims
Going through the family court system to finalize a parenting schedule and decision-making responsibility (formerly known as custody) is emotionally exhausting. ⚠ When a final order is finally signed, it is meant to provide long-term stability for your children. Unfortunately, some ex-partners misuse the legal system by attempting to reopen settled cases in places like Ottawa, London, or Sudbury simply because they are unhappy with the outcome, or to harass the other parent.
In Ontario, a final order is exactly that-final. A judge will not allow a parent to re-litigate a case just because they changed their mind. The law strictly requires the applicant to prove a material change in circumstances that affects the child’s needs and was unforeseeable when the original order was made. If you have been served with a baseless Motion to Change, it is critical to consult a family litigation lawyer from our directory to aggressively protect your family’s stability.
Step-by-Step Process to Defend Against a Motion to Change
When served with a “Form 15: Motion to Change,” ignoring it is the worst thing you can do. 📍 You must act swiftly to shut down the false allegations before the court considers modifying your current parenting time.
Step 1: Analyzing the Alleged “Material Change”
Your lawyer’s first task is to deeply analyze the Form 15 and the accompanying affidavits provided by your ex. Are they claiming you have suddenly become an unfit parent? Are they falsely alleging a drastic change in the child’s living situation? You must isolate their specific claims to prepare a targeted defence. A material change must be significant, long-lasting, and directly impact the best interests of the child.
Step 2: Drafting the Form 15B (Response to Motion to Change)
You have exactly 30 days from the date you were served (if in Canada) to file a Form 15B: Response to Motion to Change. In this document, you will firmly state that you disagree with their claims. You will check the box asking the court to dismiss their motion entirely, and you can also request that your original final order remains untouched.
Step 3: Filing a Form 35.1 Parenting Affidavit
Because the dispute involves decision-making responsibility or parenting time, you must swear a new Form 35.1: Affidavit. This is your opportunity to set the record straight under oath. You will outline the stability of the children’s current routine, disprove your ex-partner’s false pretenses with hard facts, and demonstrate that reopening the case would only cause unnecessary disruption to the children’s lives.
Step 4: Attending the Dispute Resolution Officer (DRO) or First Appearance
In many Ontario jurisdictions, like Toronto or Brampton, a Motion to Change must first go before a Dispute Resolution Officer (DRO) before a judge sees it. A DRO is a senior family lawyer appointed by the court. This is a crucial step. A strong defence lawyer can often convince the DRO that the applicant’s claims are frivolous, prompting the DRO to strongly recommend that your ex withdraw the motion before they face severe financial penalties from a judge.
Step 5: Seeking Summary Judgment and Costs
If your ex refuses to back down despite having no real evidence of a material change, your lawyer can bring a motion to dismiss the case early (Summary Judgment). Furthermore, in Ontario, the family court rules operate on a “loser pays” system. You will submit a Bill of Costs asking the judge to order your ex-partner to pay for the legal fees you incurred to defend against their baseless claims.
How Much Does it Cost in Ontario?
Defending against a frivolous lawsuit requires a strong legal strategy. As of May 2026, you should prepare for the following estimated financial considerations:
| Court Filing Fees | There is generally no court fee to file a Form 15B Response to a Motion to Change regarding parenting time or support. |
| Lawyer Defence Fees | Retaining a family lawyer to draft a robust response and attend initial conferences typically costs between $3,500 CAD and $8,000 CAD. |
| Cost Awards (Recovery) | If the judge dismisses your ex’s case for being baseless, they may order your ex to reimburse you for 60% to 100% of your lawyer fees. |
How Long Does the Process Take?
While you must file your Form 15B Response within 30 days, getting the entire frivolous motion thrown out takes time. 🕑 If it resolves at the DRO or Case Conference stage, the ordeal might be over in 3 to 5 months. However, if your ex is highly combative and forces the matter to a full hearing, defending your final order could stretch across 8 to 12 months.
Frequently Asked Questions (FAQ)
What qualifies as a “material change in circumstances”?
A material change is something major that alters the child’s needs. Examples include a parent relocating to another province, documented physical abuse, or an older teenager strongly expressing a desire to change residences. Minor disagreements do not qualify.
Can I ask the court to stop my ex from filing more motions?
Yes. If your ex-partner repeatedly files baseless motions to harass you, your lawyer can ask the judge to declare them a “vexatious litigant.” This means they will not be allowed to file any future court documents without getting special permission from a judge first.
Do I have to let my child testify against my ex’s lies?
No. Children rarely testify in Ontario family courts. If the child’s perspective is truly needed to disprove a lie, the court will appoint the Office of the Children’s Lawyer (OCL) to speak with the child privately and report back to the judge.
What happens if I just ignore their Motion to Change?
If you do not file a Form 15B Response within 30 days, the judge will assume you agree with their claims. The court can proceed without you and change your parenting time and decision-making responsibility by default. Never ignore court documents.
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