CorisCapnSkip, I like how you are always relating this to different cases with parallels to this one. I do that too, but usually get jumped on by AA supporters saying 'what does that have to do with it' well, plenty! It takes a great lateral thinker (highly intelligent I'm told) to make these associations and analogies, and they DO relate to the AA case and are relevant for discussion in comparison. Thanks for all your interesting posts!
In the case of Jefferson, I am from VA and I know that a lot of people didn't want to believe these things on him. I never knew the one about him having the child at 65. I knew he had the ones with Sally Hemmings, who was his wife's half sister (she was the daughter of Martha Wayles Jefferson's father and his slave concubine) so she may have had a resemblance to his dearly departed Martha that attracted him. Either way, he is proven to have fathered some of the children. His nephews claimed some of them and were probably fathers of some too, but since they were sons of Jefferson's sister, they'd have had Jefferson's mtDNA, but not the same Y chromosome Jefferson had (mtDNA is maternal, Y of course paternal) so any male child tracing to Jefferson's Y chromosome was certainly his son.
I am not one of those Virginia snobs who doesn't want to hear the story. I am glad to know he had other children, four of the six he had with is wife died in infancy, and only one outlived him. I also want to point out that Jefferson never cheated on his wife, all these liasons happened after her untimely death in childbirth with their sixth child (who also died). He loved her deeply and had she lived I don't think he'd have had these affairs.