(b) The father of the minor, if:
1. The minor was conceived or born while the father was married to the mother;
2. The minor is his child by adoption;
3. The minor has been adjudicated by the court to be his child before the date a petition for termination of parental rights is filed;
4. He has filed an affidavit of paternity pursuant to s.
382.013(2)(c) or he is listed on the child's birth certificate before the date a petition for termination of parental rights is filed; or
5. In the case of an unmarried biological father, he has acknowledged in writing, signed in the presence of a competent witness, that he is the father of the minor, has filed such acknowledgment with the Office of Vital Statistics of the Department of Health within the required timeframes, and has complied with the requirements of subsection (2).
The status of the father shall be determined at the time of the filing of the petition to terminate parental rights and may not be modified, except as otherwise provided in s. 63.0423(9)(a), for purposes of his obligations and rights under this chapter by acts occurring after the filing of the petition to terminate parental rights.