My brother does drugs, lies, steals from us, and I don't know what to do!?

something will happen and he will end up getting into a lot of trouble,when they cant get their fixes thay will rob steal and do what ever it takes,usually a heroin addict will do this if they are not beiing helpped they just keep getting more and more until they overdose a friend of my daughters did ,this she lost custody of her son went to jail came out and got the custody back , They thought she was clean she went to visit her old boyfriend and took some heroin again took too much and drowned in her vomit the sad thing about this she lost her Mother to cancer a month before this happened she was the caregiver of her son heis 6 years old now all he has left is his granfather his uncle his mothers brother died of an over dose about 8 years ago How sad .try to get him to help himself before its too late.