My sister and my father and my ex mother in law think he needs to be at home
BZZZZZZZZZTTT!!!!!
Wrong answer. But this is one of those instances where allowing someone to be wrong is the smart play.
Remember: you know
exactly what you're dealing with. When your son's lips are moving, he's lying. And he will attempt to manipulate you by using your darkest fears against you. That's his play.
The other thing to be on guard against is suicidal ideation. My guess is when you shoot him down about coming back to the house, he'll use suicide threats as his trump card. If he does this, don't play games: call 911 and let the police deal with it.