Sometimes the parents are not able to do everything necessary to acknowledge paternity while the mother and baby are still at the hospital. If this happens, the parents can take the form home and sign it later. When the AOP is complete, it should be mailed to: Bureau of Vital Statistics 1100 W. 49th Street Austin, TX 78756­3191 Remember, if the AOP is filed after the hospital has mailed the birth certificate information, the Bureau of Vital Statistics charges a fee to add the father`s name to the birth certificate.