His half-sister? HIS half-sister?! Now THAT is really degenerate! Doing it with the half-sister of one's late wife (Jefferson) is one thing and is, given Jefferson's great grief when his wife died, at least marginally comprehensible! But his OWN half-sister?! Fie, fie, fie! Pah, pah! Give me an ounce of civet, good apothecary, to sweeten my imagination indeed!!