(a) If a child has an acknowledged parent, a proceeding to challenge the acknowledgment of parentage, brought by a signatory to the acknowledgment, shall be governed by section 584A-403(g).
(b) If a child has an acknowledged parent, the following rules shall apply in a proceeding to challenge the acknowledgment of parentage brought by an individual, other than the child, who has standing under section 584A-203 and was not a signatory to the acknowledgment:
(1) The individual shall commence the proceeding no later than two years after the effective date of the acknowledgment, unless good cause is shown;
(2) The court may permit the proceeding only if the court finds permitting the proceeding is in the best interest of the child pursuant to section 571-46(b); and
(3) If the court permits the proceeding, the court shall adjudicate parentage under section 584A-607.