There is a series called Who Do You think You Are. He should be guest on that and search for his real birth certificate.
I’ve watched both the American version, and the UK version of that series. Since he’s such good friends with Henry Louis Gates, he should be on Gates’ PBS show “Finding Your Roots.” Maybe he could get Gates to forego reporting his true roots like Ben Affleck did getting the part about his slave owning ancestors cut from the show.