Hi guys. I am not a doctor nor do I expect anyone here to give a proper diagnosis but I need help trying to figure out what disorder a sibling of mine may have. 
My sibling is over 30 years old and I think he may have a mental disorder. He is delusional, he tries to freeload of everyone and everything. He is a pathological liar and a manipulator. He has found a way to manipulate my family and play both sides through lies and he expects people to believe him. He is very delusional and doesn’t think in a logical way. He does things that don’t make sense. He loudly talks to himself even when people are near. He doesn’t take care of himself hygiene wise. He is very messy. He has an ancient old phone and  I don’t think he has a functioning cell service. He completely lives off WiFi, has no car, lied about finishing school. Right now, he has no job but is obligated to pay my brother rent and hasn’t done so for the last few months. Anytime you try to confront him, he lies. You can never get the truth out of him. He once sold my old PlayStation and tv without no warning nor did he ask me if he could and then when I asked him about it, he lied to me. Every thing he does, does not make sense and I’m getting really aggravated and frustrated because I feel like he just uses everyone around him and he knows how to manipulate my family to have things go his way. If you’d like to know deeper details, please message me but I’m really just trying to figure out whats the best thing to do in this situation