Sparkle is right--step back from this person and their enabling family.
You really cannot make an old dog learn new tricks if they are unwilling.
Especially if his family "rewards" his bad action by indirect support.
The man is fifty years old, and presumably intelligent enough to make wise choices
if so inclined.
Quite frankly, he doesn't sound at all inclined.
His choice, his life.
Your choice to stay enmeshed.
What's happening in your own life while you are so busy managing his?
It's hard, I know, but please work on taking better care of you. . .