Box 1: Print the county in which you are filing your petition. See "Where do I. File?" in the Introduction for more information about what county you.Typical modification orders include child custody, child support, alimony, and visitation rights. Will my modification work retroactively? This free program will help you fill out the petition that you will need to file in Family Court. If you wish to change an existing custody order, you should file a petition to modify custody with your local Family Court. You can petition the court for a modification of the currently standing custody agreement. If there is a "change in circumstances" and the custody or visitation order has to be changed file this petition. Some court filing costs may be in the hundreds of dollars. Complete this form if you are a noncustodial parent (NCP) that would like to request establishment of a court order for the support of your child(ren).