These forms and instructions are available in the General Clerk's Office, Room 108, in the Nassau County. Petition to Establish Custody and Parenting Time. Statewide. DOCXPDF. CHC105.Affidavit in Support of Establishing Custody and Parenting Time. Statewide. Petition For Modification Of Order Of Custody Visitation. Learn how to apply for child support services and find procedures for establishing parentage and custody, as well as payment and enforcement. If you prepare your own petition, file it with the Clerk of Family Court on the 11th floor of the courthouse at. Follow these steps to start your Minnesota custody and parenting time case. Learn what forms you need, how to serve papers and more.