(a)
Except as otherwise provided by Subsection (b), a proceeding brought by a presumed father, the mother, or another individual to adjudicate the parentage of a child having a presumed father shall be commenced
not later than the fourth anniversary of the date of the birth of the child.
(b) proceeding seeking to disprove the father-child relationship between a child and the child’s presumed father may be maintained at any time if the court determines that:
(1) the presumed father and the mother of the child did not live together or engage in sexual intercourse with each other during the probable time of conception; and
(2) the presumed father never represented to others that the child was his own.