Correction ISO half brother brakebill

Hi! I am searching for my half brother. He was born between 1961-1963 in Chicago. Our father was Bobby Dean Brakebill. He was born in 1934 in Oklahoma, stationed in the navy in california, and moved to Illinois. He passed away in 1974. I never knew him, I was adopted at birth, and I was too young when he died. I thought that my half brother's mother's name was Leona, but I found out that it was Nora or Lenora. She was married to a man named Don at the time of my half brother's birth. I know that it was an affair, but please, if anyone has any information, or knew my father and his family, please respond. My half brother, brother, and I are all that is left of him. Thanks, Isabella