ngmucker I'm sorry to hear that your brother is a pathological gambler, it is excellent that he is in therapy, the biggest help you can give him is to make sure he continues to seek help until he is on top of the problem. If he thinks his current therapist is bad then there are organisations you can contact who specialise in problem gambling who can recommend a gambling addiction specialist almost anywhere in America. For more information about this issue and to help you to understand it better here are some links:
http://www.ncpgambling.org/about_problem/
http://www.responsiblegambling.org/
http://www.gamblingtherapy.org/
and an online self help quitting guide for gambling created by Harvard Uni:
http://www.basisonline.org/toolkits/...pSite/main.htm
GA is not to everyone's liking however so it may not be a sign of non-committment to quitting by him if he attends and then chooses not to continue with them.
I hope he gets the help he needs, that kind of compulsion to gamble almost always belies a psychological difficulty or way of being which is more fundamental than the gambling problem. I wish you both well.