(a) Subject to Subchapter D and Sections 160.607 and 160.609 and except as provided by Subsection (b), a proceeding to adjudicate parentage may be maintained by:
(1) the child;
(2) the mother of the child;
(3) a man whose paternity of the child is to be adjudicated;
(4) the support enforcement agency or another government agency authorized by other law;
(5) an authorized adoption agency or licensed child-placing agency;
(6) a representative authorized by law to act for an individual who would otherwise be entitled to maintain a proceeding but who is deceased, is incapacitated, or is a minor;
(7) a person related within the second degree by consanguinity to the mother of the child, if the mother is deceased; or
(8) a person who is an intended parent.
(b) After the date a child having no presumed, acknowledged, or adjudicated father becomes an adult, a proceeding to adjudicate the parentage of the adult child may only be maintained by the adult child.