His mother's family tree could be fruitful.
If you go out to his second-cousins, third-cousins, fourth-cousins ..., the net you can cast goes wider and wider as you go back to common great-grandparents, common great-great-grandparents, and so on.
There's got to be one of those people out there who are interested in said birth certificate.
I thought I read that VP Cheney was a distant relative...?
I would bet that the zero would pay even more to buy them off. If he couldn’t buy them off, one of the thugs in the family could probably make them disappear.