(a) If a child has an adjudicated parent, a proceeding to challenge the adjudication, brought by a person who was a party to the adjudication or received notice under section 46b-459, is governed by the Connecticut Practice Book and other provisions of the general statutes concerning the opening or setting aside of judgments.

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(b) If a child has an adjudicated parent, the following rules apply to a proceeding to challenge the adjudication of parentage brought by a person, other than the child, who has standing under section 46b-458 and was not a party to the adjudication and did not receive notice under section 46b-459:

(1) The person shall commence the proceeding not later than two years after the effective date of the adjudication, 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 not later than one year after the date of discovery of the person’s potential parentage.

(2) The court may permit the proceeding only if the court finds permitting the proceeding is in the best interest of the child.

(3) If the court permits the proceeding, the court shall adjudicate parentage under section 46b-475.