In both Oblivion and Skyrim there are Mottiere's who have something to do with the Dark Brotherhood. Amound and Francoise Mottiere. Francoise says he's leaving Cyrodiil but never says where. Then in Skyrim Amound hires you to kill Emporer Titus Meade. Is it a coincidence? Maybe, but i believe it isn't. I've never played Morrowind but let me know if another happens to be in that one as well.

That's correct. Which begs the question - how did a rich nobleman, Francois Motierre, end up in such a predicament. And another question: was he a member of the Elder Council like his descendants?