EtaCarinae wrote:...Anyway my question is if I go to the police station and make reports when he is putting us in hell would it help us and in what way ?...
A police report will not put him in jail. He would have to be arrested, tried and convicted. Just like everyone else in the US. These are rights guaranteed by our Constitution, even to him. And all of that stuff takes time and right now it is just threats. Nothing illegal has happened yet, so far as I can tell, except for the drug-taking which you have no real evidence of. Even with a drug test showing crack in his system the police are going to be far more interested if they can get him busted in the act, preferably the act of buying rather than using.
What you want, I suspect, is a restraining order. This would make it so that your brother would not be able to come within a certain number of feet of the house without risking arrest. The problem is that restraining orders are, by their very nature, temporary. You'd be right back where you started. And, either way, your brother would know. That's another right guaranteed by the Constitution -- the right to face and know your accuser.
You cannot hide from this and your mother is enabling your brother's putative addiction. What may make the most sense is to see if you can get a competency hearing regarding your mother. If she is no longer capable of making good decisions in this area then she may be in others as well. Then you'll be able to move her, etc.
This will, though, also expose you as being the person doing the acting. Essentially what I'm telling you is that you cannot sit on the fence with this and expect it to all work itself out without you being exposed in some way.
I suggest a few things:
1) If you have other siblings, or at least cousins (e. g. your mother's nieces and nephews), talk to them. Find out what they think about your brother's and mother's conditions. They may have insights.
2) If there's no one like that, try the neighbors. You said that this has apparently been going on since before you moved back, so the neighbors probably noticed something or other. You might want to encourage them to call the cops if they see any drug dealing. They should be able to make anonymous reports and, while that might not lead to much, it would at the very least (I hope) show your mother that the problems with your brother can't just be wished away.
3) Contact the police or an attorney and ask what'll happen if you file a report. Get the straight dope straight from the horse's mouth. If they can help you without much danger to yourself, jump at the chance.
4) Take steps to protect yourself and your mother. Your brother may be on the verge of becoming violent and he may also be on the verge of starting to steal in order to support his habit. Protect yourself and protect your assets.
5) If #3 is not appealing, try speaking with your doctor or your mother's doctor or a clergyman. We're sympathetic here but we're not in the midst of your life. Talk to someone you trust. Best of luck to you.