Order (Relief from Support Payments and Commitment). PDF. 4-16. Notice of Motion To Quash, Fix or Modify Conditions of A Child Support Subpoena.In order to complete this form, you will need a copy of your existing child support order. If you do not have a copy, ask the Clerk of Court how to get one. Use this program to ask (or "petition") the Family Court to change a support order if there is a "change in circumstances." To file your request, review the instructions worksheet, then complete the Motion to Modify Child Support and the necessary Financial Statement. If you do not have a copy, ask the clerk of court how to get one. Explain your change of circumstances. Short form financial statement (used for child support), PDF. Fill out a child support modification petition. 2.