Well, one thing's for sure. Truscott is narcissistic enough to drown ten men. And there's really no substitute for family connections, since none of his blah blah blah would otherwise have come about. "Fatuous" is the word!
I notice that he emphasized the story about the elderly Sally Hemings tending to Jefferson's grave three times a week, being from the Hemings family oral tradition. I think we can thus safely discount the story, as a prop fashioned to hold up the myth that she was Jefferson's lover. Keep in mind, that Truscott is at best indifferent to the truth. He's just interested in whatever will support the story he's peddling, so that he can continue playing the Great White Father.