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Is he hurting anyone else? If not, let him be, don't be arrogant and self-righteous! He may have a different outlook on life than you have. He may have matured.

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are you mental?---you could do the let him hit rock bottom, but if its as bad as you say and you are actually want to make the effort to take real steps, if he is living on his dad's money talk to the father about it, maybe ask the father what he thinks about rehab,