Unknown boy and girl

Studio portrait of young boy and girl, probably siblings. Although found in a cardboard photographer studio frame, there are no markings of any kind on picture or frame. Someone has outlined the picture in what looks to be pencil.

This was found in the effects of Elois Humble of Lamont, CA. I believe it could belong to the family of Elois's step-father, Corwin Walker born 1891 died 1966. Corwin was the 2nd husband of Elois's mother Atha E. Turner. Another possibility is that it belongs to the family of Elois's 2nd husband, Ray Buchwitz. The Turner's lived in Nowata, OK in the 1930's. Atha and Corwin Walker lived in Ventura, CA in the 1960's, and Elois and Ray Buchwitz lived near Bakersfield, CA in the 1950's.