Okay movie fans out there... There's a movie I can't remember the name of.
It's about this balding guy with a mustache getting married to this woman that has multiple sisters (one of her sisters is in a wheelchair and is either retarded or mentally disturbed) Basically he kills his wife marries her, "Down to Earth" hippie sister that later cheats on him so he kills her next. Then he marries her other sister that acts shy and innocent (turns out to be a gold digger) so her kills her next to prevent himself from going broke. Ends up with the last sister (wheelchair bond) and it turns out to be his original wife (she switched places with her) now its her turn to get revenge. Most likely 90s.