Rule 91.3.Post-Judgment Petition to Modify Legal Decision Making; Parenting Time; or Education Order
Part XI. Post-Decree/Post Judgment Proceedings · Last amended January 1, 2026 · Last verified September 4, 2026
Full Text of Rule 91.3
Rule History
Added Aug. 30, 2018, effective Jan. 1, 2019. Amended on an emergency basis Aug. 24, 2023, effective Jan. 1, 2024, permanently adopted with additional amendments Aug. 22, 2024, effective Jan. 1, 2025; amended effective Jan. 1, 2026.
Plain-English Summary
Rule 91.3 is the parenting modification rule, and its requirements are heavier than the money modifications in Rule 91.1.
What the petition must carry
Compliance with Rule 91; detailed facts supporting the modification; verification by the applicant or supporting affidavits as A.R.S. section 25-411 requires; and, where the order or decree was not entered by an Arizona court, the affidavit A.R.S. section 25-1039 requires. Service must satisfy Rule 91(j) and A.R.S. section 25-1035.
Two of those come from the interstate custody statutes -- the extra affidavit and the extra service requirement apply precisely when the existing order came from somewhere else, and they exist so the Arizona court can confirm it has authority to modify another state's order before it does.
Disclosure keyed to the last order
Five categories, and four of them measure from the same point -- since the last decree or judgment addressing legal decision-making or parenting time:
- current protective orders and their petitions involving a party or household member, or any prior order or petition filed since the last decree;
- for each parent and child, treatment providers and treatment periods for psychiatric or psychological issues, anger management, substance abuse or domestic violence;
- criminal charges and convictions of a party or household member, with date, description, location and documentation;
- Department of Child Safety investigations or proceedings, with the same detail; and
- relevant documents regarding any relevant statutory factor.
Compare Rule 49(d), which asks the same questions at the start of a case using fixed lookbacks -- 5 years for treatment, 10 for criminal charges and child safety matters. Post-judgment the window is whatever has happened since the last parenting order. The court already knows the history; what it needs is the change.
Education orders
If the court finds it in the children's best interests, any order granting modification must include an Education Order substantially conforming to Form 19 or Form 20 of Rule 97. Where one was previously issued, the court may vacate or modify it on the same best-interests standard.
Frequently Asked Questions
What must a parenting modification petition contain?
Rule 91.3(a) requires compliance with Rule 91, detailed facts supporting the modification, verification by the applicant or supporting affidavits as required by A.R.S. section 25-411, and where the order was not entered by an Arizona court, the affidavit required under A.R.S. section 25-1039.
How far back does my disclosure have to go?
Rule 91.3(c) keys the disclosure to what has occurred since the last decree or judgment addressing legal decision-making or parenting time, rather than to the fixed 5-year and 10-year lookbacks Rule 49(d) uses at the start of a case.
What if the existing order came from another state?
Rule 91.3(a)(4) requires the affidavit under A.R.S. section 25-1039, and Rule 91.3(b) requires the applicant to comply with A.R.S. section 25-1035 in addition to Rule 91(j).
Does the petition have to be sworn?
Yes. Rule 91.3(a)(3) requires the petition to be verified by the applicant or supported by affidavits as required by A.R.S. section 25-411, on top of the Rule 91(c) verification requirement.
Can an education order be changed?
Rule 91.3(d) requires an order granting modification to include an Education Order substantially conforming to Form 19 or Form 20 of Rule 97 if the court finds it in the children's best interests, and allows the court to vacate or modify a previously issued one on the same standard.