Francois Motierre is a breton commoner living in Chorrol. He has been targeted by assassins from an underground organization who he owed a great sum of money too. Even though he now has the money to pay the organization feels 'insulted' and is going to kill him anyway.
Out of desperation he contacts the Dark Brotherhood to fake an assassination on him so the organization will think hes dead and leave him alone. The Dark Brotherhood originally refuses saying "The Dark Brotherhood is not in the business of staging deaths, no matter how much gold is offered. Sithis demands blood, and blood must be paid." So Francois offers his mother's life to which the Dark Brotherhood then accepts.