look after yourself dear,Remember that saying 'Let go and let God' If you let yourself go down what good is that? i t won't cure your brother ,it won't fix your sister .I have walked a similar path a few times in my life.As the eldest sister in a family of six ,many times i felt like i had been in a ten round fight with Sonny Liston ,,physically emotionally financially wiped out.So yes I turned to booze but I;m hoping no more.I couldn't stop my brother/sister in law from cancer, I couldn;t prevent the disasters but I CAN help myself SO CAN you .May be if you are a church member or have access to a local Church the clergy can often send help through another parish close to your brother .there are a lot of angels in the world,stand back and let God use them good night