You can't make anyone do something they don't want to do. You can, OTOH, make a point of protecting yourself from their lifestyle. When you say "family" you mean children? He's headed for an early grave, especially with the untreated high BP. One of our neighbors ended up with kidney failure due to not treating his. His lifestyle is threatening the well-being of his children. Insist that he take out a life insurance program because at this rate he'll die early and you want to be sure that they're taken care of when it happens. Then do what you have to do to remain healthy.