Proceedings under this chapter may be instituted upon petition, verified by oath or affirmation, filed by a child, a parent, a person claiming parentage, a person standing in loco parentis to the child or having legal custody of the child or a representative of the Department of Social Services or the Department of Juvenile Justice. The child may be made a party to the action, and if he is a minor and is made a party, he shall be represented by a guardian ad litem appointed by the court in accordance with the procedures specified in § 16.1-266 or § 8.01-9. The child’s mother or father may not represent the child as guardian or otherwise. The determination of the court under the provisions of this chapter shall not be binding on any person who is not a party. The circuit courts shall have concurrent original jurisdiction of cases arising under this chapter with the juvenile and domestic relations district courts when the parentage of a child is at issue in any matter otherwise before the circuit court. The determination of parentage, when raised in any proceeding, shall be governed by this chapter.