1) Don't tell your future in-laws you have money without them knowing he's rich.
This never works out. The parents are poor, and they want money, but they didn't know they'd get it anyway. Sorry, you must die at the hands of your would-be-in-laws while your fiancee is sleeping and having a prophetic dream about your death. She seeks vengeance by law and has her parents executed. She probably got all the money, though, so good for her!