I did quite a bit of hunting on him and really struck out on sources. I can't find any evidence of him on the 1940 Census, and that would have been a gateway to at least his mother. Reportedly his mother married Frank Sr not too long before Frank Jr's birth (within a year maybe?) and had 2 previous husbands who had fathered 9 children prior. So tracking her by last name will be a challenge. I couldn't find Frank's siblings names either, so no luck there. Frank Sr was in and out of the picture quickly - maybe married around 1933-1934 and divorced by 1936-1937. Moved from Texas prior to 1940 and probably in Oakland, Alameda area by 1940.