Commonly used forms in Family Law proceedings including petitions for different types of restraining orders, child custody and support cases, and parentage " Fill out these forms: Request for Order (Form FL-300).These forms and instructions are available in the General Clerk's Office, Room 108, in the Nassau County. For assistance with these matters please contact the Family Law Facilitator or Volunteer Legal Services. W ho is the "Plaintiff"? The "Plaintiff" is the person filing for custody.