How old was his father ? What do you know about him .?.Find this out first--never mind SSDI ..make a family trail Basic
person --Born. Ok you have a residence or Co at least--for census if before 1940 ..Do you know any other family members that you can group them ,with that family ? When you find that father usually you can find the next set of parents bro and sisters .
Write what you have down and e-mail it to me .Ill see if I can help you or at least give it a try. firstname.lastname@example.org