Colorado Revised Statutes Title 19. Children's Code § 19-4-107. Determination of father and child relationship--who may bring action--when action may be brought

(1) A child, his or her natural mother, or a man presumed to be his or her father pursuant to section 19-4-105(1)(a), (1)(b), or (1)(c) or the state, the state department of human services, or a county department of human or social services, pursuant to article 13 or 13.5 of title 26 or article 5 of title 14 may bring an action:

(2) Any interested party, including the state, the state department of human services, or a county department of human or social services, pursuant to article 13 or 13.5 of title 26 or article 5 of title 14 may bring an action at any time for the purpose of determining the existence or nonexistence of the father and child relationship presumed pursuant to section 19-4-105(1)(d), (1)(e), or (1)(f).

(3) An action to determine the existence of the father and child relationship with respect to a child who has no presumed father pursuant to section 19-4-105 may be brought by the state, the state department of human services, a county department of human or social services, the child, the mother or personal representative of the child, the personal representative or a parent of the mother if the mother has died, a man alleged or alleging himself to be the father, or the personal representative or a parent of the alleged father if the alleged father has died or is a minor.

(4) Regardless of its terms, an agreement, other than an agreement approved by the court in accordance with section 19-4-114(2), between an alleged or presumed father and the mother or child does not bar an action under this section.