Have you ever heard of this and is there a name for the behavior?

I have a German Nephew. His attitude is odd. His mom doesn't know what is going on with him... He is angry all the time. He strikes worse at the people who love and tolerate him the most. When things are good he insults everyone. When things are bad he gets very verbally abusive. He keeps wishing his mom was dead. He makes racist remarks. (his life is okay.. even in the economic down turn) He was kicked out of the army because he picked fights with the Mexicans and Black officers. The army kicked him out because his need to fight with everyone but the enemy.. & his lack of respect for authority figures. He has this love of weapons... None of his siblings act this way. (before the army)He dropped out of high school.. fought with the White teachers..he was always disrupting classes.. his teachers said he was very smart.. but seem to need their attention. When they didn't give it to him.. he would go ballistic. He married somebody with a drug problem that didn't want him.. she assumed he would be her ticket from her mom. .. up until she found herself working at a dairy queen to support him .. while living in her mom in law's. He's very verbally abusive to her and she puts up with it because she's living with his mom.. He was fired from an electrician apprentice job, and two fast food places.. because he threatened customers for talking down to him. He seems to always be the victim... He has panic attacks and looks for excuses to be physically violent.. with people he doesn't know.. he thinks he is smarter or superior ...he gets grandiose ideas and even when they fail.someone else is always to blame... they usually fail because they are not based in reality. He's not a real alcoholic but when he wants to be perceived as tough he'll glug a case of beer and chain smoke cigarettes.. He bought a huge bag of weed but didn't smoke it all because he had seizures and cardiac distress...hasn't tried weed since. What is this? The army had sent him home on dishonorable discharge.. with a medical statement.. he says he had post traumatic stress syndrome.. but ..his behavior has been like this since before his panic attacks/army. .. She would like to know what she is dealing with..is this just some odd behavior.. or something that needs therapy?