Child Support Forms ; 4-8. A support or F petition is filed when a parent, guardian, spouse, or other relative wants child support from a non-custodial parent.Provide your full name, Child Support case ID or birth date, description of your concern(s), phone number, and the best time to reach you. The Law Department assists local and out-of-state custodial parents in establishing an order of support from non-custodial parents. What are the steps to file for child support in New York? Contains Fields to Complete on-line (print out for filing). Call: 311, request "Financial Counseling," and request an appointment with a NYLAG financial counselor. Under New York Family Court support rules, only certain people and entities may petition Family Court in an effort to initiate support proceedings. Usually these costs are split up proportionally based upon how much each parent earns. Retroactive Child Support in New York.