The “Doc’s” doc comes from an agency that didn’t exist until 1963. It’s not a very credible source of information. It also doesn’t jibe with the 1960 and 1961 Natality Reports which used different classifications for race than what appears on the Doc’s doc.
Had to use what he's using and it all seems to be coming from and through him so...
By his thinking/rationalization Sr was of mixed races and I just don't see it.