Instead of asking HERE... you need to strap him in the car and the whole lot of your family head for family counseling. These problems don't occur in isolation -- there may be anger and family issues driving his need to escape (some of which may not be obvious to other family members).
These problems are rarely solved in isolation, i.e. just sending him alone to counseling. This is the kind of stuff that always rings alarm bells later when something goes seriously awry.
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