<human>: Summarize the given text in a few sentences.

I grew up in what I think to be a normal family. My brother and I have two loving parents and they're completely awesome. However, for the past several years my brother has become extremely withdrawn and quiet. It's gotten to the point that I believe he has become a sociopath and on the brink of becoming a straight up psychopath. He has attended university (different from mine) for four years and has managed to make zero friends. He refuses to engage in any of our family events or even bother to talk to any of us.

I have not had a legitimate conversation with him in over 6 years.

When we sit at the dinner table as a family, he is the only one who remains completely silent. Sometimes he gets a really pissed off expression when someone is talking and stops eating. My parents and I have tried to get him to open up but he avoids talking whenever he can. In fact, the only times he speaks is when he is asked an important question that cannot be answered with a nod or shrug. He never leaves home unless forced to. I've gone on many trips with my parents and my brother decided to stay home every single time. I have absolutely no pictures of him on any of my facebook photos. Even when we go shopping for an hour, he would rather continue sitting in his room on his laptop or playing games. His ability to communicate appears to be nonexistant.

Really need ideas on how to get this guy to change. Right now, I can compare him to a stranger that lives with us. He doesn't do anything with the family. He doesn't cook for us, play music, play sports, make us laugh, tell stories, or talk with any of us in general even though we continuously feed him and support his education (majoring in philosophy). He literally does nothing to help the family... if he made us smile every once in a while it might be okay but he doesn't even do that. Nobody enjoys his presence. To end things, I haven't seen him genuinely laugh or smile or cry, or express emotions other than slight anger in over 5 years. We don't know what to do anymore and my hatred for him is only increasing.

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<bot>: Brother of mine is completely shut in and refuses to communicate with anyone, including our family. Spends 95-100% of everyday by himself and does not express emotions of any kind. Need advice on what to do with this guy...