First off, where do you and your father live, and where does your mother live? It doesn’t sound as if your mother is the proper candidate to raise your son, as she is obviously not doing a good job. It is one thing if you push your teenager to grow up so fast by making them hold down a job and teach them how to cook and manage their money, etc., at an early age. It is quite another if you are letting them drink alcohol and smoke cigarettes in your own home, as if think it is OK for them to do these things. And how does she react and discipline your brother for not going to school full days, getting kicked out of school and stealing? If the answer is “not much,” or if her rages are triggering your brother to act out of control, then it’s clear that she needs some serious professional help in improving her skills.
I will say this until the day I drop dead – you need to balance the concepts of parents and friend if you want the exact amount of respect you desire from your kids. And your mother is going over the edge with the friend thing – not the best idea.
I suggest you and your father indeed take your brother in. It will be definite that he will have issues, so I urge to be open with him, and encourage him to be open with you – no secrets. Tell him that you know your having problems, and you know he probably misses his mother, but she does not have what is best for you in her mind. Don’t judge him, don’t make threats and don’t be lectureous. Then, insist that he go to school full time and hold down a good-paying part-time job. And most of all, don’t speak ill of the mother to him, to give him any ideas.
As for the mother, I would definitely take her to court for custody, especially if that she wants. Have you tried talking to her about your brother’s behaviour? If not, I suggest you do; if you have, and she will not listen (and insist that there’s nothing with what she’s doing), then I would agree with HER (LOL) that legal action needs to be taken. However, when you bring up all the boy’s behaviour problems when presenting your case, she should not be surprised if custody goes to you and your father. Anyone with half a brain would read your story and agree that your father has the most stable environment. I wish you the best of luck you may need.