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Military school or a boot camp of some sort is what I would do if this were one of my kids. If it has progressed to such a point as you describe, no actions your family has taken has had any effect and it's time for something radical and new.
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I saw a jerry springer eposide, where former Marines drill sergeant displined naughty teens and turned them into good citizens.
http://www.bootcampsforteens.com/ I think this should help your brother