My twin brother is a drug addict. help?

my brother is a repeated drug addict. He has stolen from not only myself but almost my entire family as well. He used to be involved with gang activity (not anymore) and is now living in a bad situation. i live over 300 miles away from where he and the rest of my family lives. i have not seen him healthy for over 5 years and he is getting progressively worse, my sister stays in contact with him, i don't contact him because every time he seems to work me for money. i haven't seen him or talked to him for over a year now. Last time i talked to my sister she told me that he has kept himself clean and even has a sponsor so that he doesn't resort to his old behaviors. His physical wellness is deteriorating very quickly and his teeth are mostly broken, and decaying. i myself have the capability to help him receive the medical treatment, housing (with me), safety and food that he would require to not need to be in the horrible situation; begging for his friends who degrade him, for a place to live. But as history shows i have no idea if i can trust him. I have so much emotion and torn on the subject because last time i tried to help he rejected me because he refused to get clean or at least completely clean. i have no idea what to do, we grew up in a broken house hold where we were blamed for our father death of cancer by a neglectful mother and we basically only made it out because of each other, we were very close, and then when we turned 18 he started destroying himself almost systematically and rejected the family that cared, only coming around to steal money from them. i myself am getting help for the traumatic experience, but again i hear all these stories about him from my sister and i feel like i can help, like i should help him, but there is nothing i can do from so far away. all i have are the thoughts of bringing him to where i live away from all the problems and helping him while still trying my best to live a normal life fill my head and it seems impossible. i have no idea what to do, if i take him in he could just be in the same situation here that he was there, or even a few months down the road fall into the same bad habits after i exhaust myself to help him. and bring him back form that negative path or helping him to, that i will be just stabbed in the back and have to go through the whole ordeal of it again. i want to help, but my instincts are telling me to just stay as far away as possible. if anyone has been threw something similar or has any advice i would love for your insight/ help. thank you.