I hate to play devils advocate but is this brother really obliged to help anyone with anything? That's not how life works i'm afraid. Your friend can be comforted by the fact that he's a better person and did as much as he could for his brother - but if he's brothers success is genuine it was still his own. Your friend simply helped him. Most successful people have help along the way. I would also urge caution about assuming too much in regards to their relationship - no one knows exactly what goes on behind closed doors and for all you know his brother could have an exceptionally good reason for keeping his distance. For now i wouldn't involved yourself too much - help and support your friend as much as possible but keep in mind that ultimately this is really none of your concern.