its very disgrace to hear this brother...inshallah allah will surely guide him right path.....
be kind to him ...try to tell him this is not good habit wen he is in relaxed situation,since he is ur brother u know obiviously wen he will accept advice.. ..."ALCOHOL IS THE MOTHER OF ALL EVILS AND IT IS THE MOST SHAMEFULL OF EVILS"-----In sunan-IBN_MAJAH volume 3,BOOK of INTOXICANTS ,chapter 30 hadith N0.3371
for further things u can find here and u can tell to ur brother by telling all these points ..
http://www.irf.net/irf/dtp/dawah_tech/mcqnm12.htm
may these will help u to support u wen u tell to ur brother...
MAY ALLAH GUIDE US THE RIGHT PATH..
AMEEN!!!!!!!