Petition for (Custody) (Visitation). Where to File for Custody.Custody cases are usually started in Family Court. First Petition for Child Custody. Form PS-05: Use this form only if this is the FIRST custody order for your children. A parent or 3rd party may file a Petition for Custody and Motion for Special Immigrant Juvenile Status. Each of the documents listed below inculde a blank form and the instructions to fill out that form. Use this form to change an existing child custody order. File the form in the Circuit Court where the child lives or where either parent lives. Box 1: Print the county in which you are filing your petition.