Born 1965 or 66 Denton, TX Sibling Search

I have very little information as my mother has passed away. I am searching for a half sibling, born to my mother, in the Denton, TX area in last half 1965 or first half of 1966. I do not know the gender of this child. Last name of baby before adoption could have been "Bays" or "Crowell". Birthmother was 15 or 16 at time of birth. Birth family had connections to the US Air Force and the Church of Christ. (Not sure if adoptive family had the same connections.)