By signing in or creating an account, some fields will auto-populate with your information. These forms and instructions are available in the General Clerk's Office, Room 108, in the Nassau County.This chapter of the Texas Family Code describes who can file a SAPCR, how they must do so, and what the petition must contain. Texas Family Code, Chapter 103. Petition for (Custody) (Visitation). You will need to fill out a Civil Case Information Sheet form, which you can get at the courthouse.