Makes a lot of sense JAPES! I can see his family knowing what his achilles heel is and that being money, so yeah I can imagine them using money as his carrot.
Being able to ask for a few hundred pounds here and there wouldn't satisfy him when he is aware how much money he could have to do as he please with no strings attached if his family were out of the way.
Mat, it often starts by appearing to be given generously, as in, "You only have to ask", but because there's another agenda, it soon turns to "but we only gave you £X weeks/months ago. What do you want it for this time? This is the last time you get anything from us" That's often the time when the opportunity to cut lose has passed by. Anger, frustration I can understand. Murder is beyond my comprehension.