Looking for Birth Family of Charles Edward Bn Gentry an

Trying to find the Birth family of my deceased father-in-law. He was adopted at Anadarko, ok. He was about 4 years old, born in 1925. His mother was dying of some disease, we think TB. Other siblings names are possibly Ida mae, ralph, bert, john,and clark. Do not know if they were adopted. Think mother was full cherokee and dad was 3/4 choctaw. possibly a link to Owens. perhaps an Anna m. owens.