<p>A 6'5" young man whose mother is afraid to confront him because of his temper? Your brother really needs to see someone who can check him out physically and mentally. An addiction or depression could cause this kind of behavior, but it could be a lot of other things, including a physical illness, a personality disorder, or a mental illness like schizophrenia or bipolar disorder. If your parents are going to take action, I would start there, by insisting on a thorough checkup, before making other changes.</p>
<p>If your brother does have an underlying condition, there are a lot of viable treatment options that could dramatically improve his quality of life. And if he doesn't, at least your folks will know he has no excuse, and can feel a lot more confident in setting limits.</p>