<human>: So my sister recently started dating this guy she knew back in middle school. She's in college now...he's... well I'll get to that. He has some serious family problems that range from various addictions to run-ins with the law. He lived on the other side of the state doing pretty much nothing for several years. 

About 3 months ago, they started talking on Facebook and impulsively, he decided to move all the way across the state to be with her. He has no job, and no car or anything, which makes it very difficult to live in North Carolina. But apparently he got a job scrubbing dishes at a bar and bought a moped last month.

The biggest problem with him is that he is manipulative and is driving a wedge between my sister and her family. His personality is the worst, he's one of those one-uppers, who thinks he's a beer connoisseur (he's only 21 and his favorite beer is bud light)(He also looks like he's 15). He thinks he knows everything and will bullshit you about all his accomplishments and hobbies...like playing the guitar...poorly. He was trying to move in with my sister after only about a month of talking (not even dating). 

My parents have met him, and they don't like him. I don't like him, all of our friends don't like him. The only person who "likes" him is my dad who lives far way and just wants my sister to be happy.
This guy though, doesn't know what its like to have a functioning, loving family and he doesn't care if he takes that away from my sister. He has threatened to marry her right away and run away together. He gets upset when he is challenged and has to remind everyone that "he is an adult" and"he can live his life the way he wants."

This guy is bad news and my sister is stubbornly in "love" and can't see how he's driving a edge between her family. What do I do? I don't want her to learn the hard way that this guy is no good. :(

Give me the gist of the text in a nutshell
<bot>: Sister's pretentious, bastard, boyfriend is threatening to marry and run away with her and take her away from her family.