You can file a petition for child custody in your county's Superior Court. If you are divorcing, the petition will be included in your divorce papers.Insert the civil action file number from the Complaint or Petition which was served to you. Go to a notary public at your local bank or other place of business. My name is and I am filing this Petition for a Declaration of Custody pursuant to O.C.G.A. § 9-4-2 and § 19-9-61. In support of my case,. STEP 1: Complete the Domestic Relations Filing Information and. Final Disposition Forms. A) You are still married – Divorce with Children b) You were never married and you are the mother– Declaration of Sole Custody. Complete this packet if you are a biological father seeking to legitimate your relationship with your child born out of wedlock.