He starts here:
Texas Paternity Registry
Dept. Of State Health Services
P.O. Box 12040
Austin, TX 78711-2040
(888) 963-7111 ext. 7782
Can we help you find something?
(VS134 form - $10 or $18 fee)
The link doesn't work, so try calling. A putative Father's Registry allows your son to register as the possible father. The courts will require that he approve any adoption. The next step is get an attorney. The attorney may be able to file an injunction preventing an adoption from taking place without his participation. Once the child is born he can petition the court for custody.