The name and address of the other parent. Qualified Medical Child Support Order.1. Fill out a child support modification petition. 2. File the petition with the Family Court that most recently established your order. 3. Non-custodial parents seeking to establish or modify a child support order should contact the Probation Department. Modification: A court can modify a child support order based on the filing of a petition requesting that it do so. Call (631) 430-4445 to speak with an expert child support attorney in Suffolk County. Either parent can file a motion to modify an existing child support order at any time. The court will schedule the matter for a hearing. Intheblanks form authorizing a filing agent to efile documents on behalf of an individual attorney.