In most counties, necessary forms used in the guardianship petitioning process are available from the probate court clerk. To get guardianship of an adult (18 years or older), you will need to fill out several court forms and file them in court.Fill out guardianship forms. Complete and sign the documents listed below. A separate form should be completed for each child. You are summoned to appear at a hearing on a Petition for Appointment of Guardian of. Court Forms for the Probate Division. The forms below are some of the most common forms used in the Probate Division, but there are many more. The Court has jurisdiction to appoint a Guardian under §§203-204 of the Uniform. Everything you need to write a declaration letter to the judge in your custody case: an example, a downloadable template, an outline and tips.