Searching for sister, born 1958-1961 Louisiance

Have friend who was born in Shreveport, Adopted through VOA , birth date is 2/7/1961.....Non-id info says ** from large family , BF was a mechanic married to someone else at the time of my friend's birth, and that BF also had children with his wife. ** also had son born June 1958. I realize this post is old.