I also have a sibling that doesn't take too kindly to any 'observations' about his drinking habit. It's always a "Pot calling the kettle black" situation since I am an admitted alcoholic and my brother is always "completely under control" of his drinking. He crashed his car into his garage last year...his foot "slipped" on the pedal...at 2am...coming home from the bar.
I don't talk to him much anymore, mainly because he's a douche-bag drunk and sober haha