Indiana Code Title 34. Civil Law and Procedure § 34-6-2.1-139

(1) the child's birth mother and father who:

(2) in the case of adoption, the adopting father and mother of a child;

(3) where custody of a child has been awarded in a court proceeding to someone other than the mother or father, the court appointed guardian or custodian of the child;

(4) where the child's parents are divorced, the parent to whom the divorce decree or modification awards physical custody or control of the child;  or

(5) if the child's parents are living apart, the parent to whom physical custody or control of the child has been awarded by a court order.