(a) Challenge by signatory. After the period for rescission under section 307 of this title has expired, a signatory of an acknowledgment of parentage or denial of parentage may commence a proceeding to challenge the acknowledgment or denial only:
(1) on the basis of fraud, duress, coercion, threat of harm, or material mistake of fact; and
(2) within two years after the acknowledgment or denial is effective in accordance with section 304 of this title.
(b) Challenge by person not a signatory. If an acknowledgment of parentage has been made in accordance with this chapter, a person who is neither the child nor a signatory to the acknowledgment who seeks to challenge the validity of the acknowledgment and adjudicate parentage shall commence a proceeding within two years after the effective date of the acknowledgment unless the person did not know and could not reasonably have known of the person’s potential parentage due to a material misrepresentation or concealment, in which case the proceeding shall be commenced within two years after the discovery of the person’s potential parentage.
(c) Burden of proof. A person challenging an acknowledgment of parentage or denial of parentage pursuant to this section has the burden of proof by clear and convincing evidence.
(d) Consolidation. A court proceeding in which the validity of an acknowledgment of parentage is challenged shall be consolidated with any other pending court actions regarding the child.