I've used Focus on the Family's help line and they were a great resource. Even if you're not a Christian, they are used to dealing with difficult situations like these and their advice is based on solid moral values.
Besides this point however, it sounds like your son's depression has made him turn to drugs. I wouldn't kick him out, but I might suggest getting him into rehab? Also, if he stays in the house, be loving but strict. Lock your valuables up in a safe. Use 'tough love'. Bribe him with money... tell him you'll give him $5 every time he does the dishes or cleans his room. This will get him in the habit and he will feel like he's getting something in return. Obviously its money that's motivating him. If you feel uncomfortable giving him money, ask what he wants it for and try gift cards. Gift cards to gas stations, Walmart, the movie theater, etc. That way you have a little control over what he spends it on.View Thread
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