The name and address of the other parent. Ask the Family Court to change an existing child or spousal support order because of a "change in circumstances.The first step in modifying child support and custody orders is understanding the grounds upon which such modifications can be requested. To request a modification of the child support order in New York, you need to file a motion with the court. If you are married and are asking for spousal support or a change to your child support order, fill out the Family Case Information Statement. You can request a modification in your custody agreement for custody, visitation and child support. In this guide, we will outline the steps involved in filing a motion to modify your divorce decree and provide tips on navigating this process successfully. If you are looking to file a child support modification petition, you can find the form for "petition to modify support. After review, the petition or pleading is sent to the Family Court in the county where the non-custodial parent lives. If it's already been converted to a court order you file for a modification.