Okla. Stat. tit. 10, § 10-7700-609: Limitation in proceeding with acknowledged or

adjudicated father.

A. If a child has an acknowledged father, a signatory to the

acknowledgment of paternity may commence a proceeding seeking to

challenge the paternity of the child only within the time allowed

under Section 15 or 16 of this act.

B. If a child has an acknowledged father or an adjudicated

father, an individual, other than the child, who is neither a

signatory to the acknowledgment of paternity nor a party to the

adjudication and who seeks an adjudication of paternity of the child

shall commence a proceeding not later than two (2) years after the

effective date of the acknowledgment or adjudication.

C. A proceeding under this section is subject to the

application of Section 16 of this act.