How do I confront the family problem member?

My brother has become a burden to my family. Since he lost his apartment, he has lived in all our homes, with the same outcome - we kick him out because he is dirty, disrespectful, and lazy. He seldom showers, drinks a lot, smokes cigarettes and weed, has a part time job with no goals of pursuing a full time or an education, sleeps with his clothes and shoes on (those socks can knock out even a body builder!) leaves food and garbage strewn about, uses swear words in front of the kids, sleeps all day and is on the computer all night, takes the kids' snacks, and on and on. He stayed in my home for four months, and only paid 1.5 months of rent - I charged him $200/mo. I am a single mom who works full time and in college part time. I have two kids. He stayed in my mom's house for a few months, in her basement and could not eat or smoke or shower because my stepdad despises him. And now he is staying with my brother but his mother in law is returning next month and she will be paying rent, vs him who only eats everything in sight. My sister in law is disgusted with the smell emanating from his room - she gags everytime he opens the door. I have suggested a family meeting, because now he will be on the street again. My brother has tried one on one and the only result is him getting up while swearing and walking out. He is always on the defensive, and swears there is some kind of consipracy theory set out on him. So, "intervention' style seems to be the only way to try with him. But where do we start? What do we avoid? Anyone have experience in trying to get someone like this on the right path again? Oh, he is 24. He tried to move to Texas in serach or a relationship with a girl he met on MySpace, but she broke it off before he left. And no, we have not been rude to him, at least for a while. We have let him do his thing without interfering, but obviously that has gotten us nowhere, and fast. PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!…