In order to file a Guardianship petition in California, the child must reside in the state for at least six months before the petition is filed. Gov or at the courthouse.A blank Caregiver's Authorization Affidavit is available at the Sacramento County Superior Court website under local forms. A Caregiver's Authorization Affidavit is a form you fill out and give to a child's school or health care provider. Information on how to complete the form can be found in "The Guardianship Book for California: How to Become a Child's Legal Guardian" published. Make sure you have all the forms you need. Legal guardianship is a court order that says someone who is not the child's parent is in charge of taking care of the child. Caregiver's Authorization Affidavit. Guardianship Information Session 17A How to complete petition and supporting documents Richmond County Surrogate's Court Irini Bekhit. Applying for Guardianship Step One: 2.