no one should have to live in fear or deception. i'd say tell him....there stand to be major reprecussions, but if he trully is a man he will learn to get over what he wants. if it has negative effects just bring it to his attention no person should live a life to what others expect and he should want what makes you happy. i have a gay friend, and his life was basicly shit (atleast in the fact he was never happy at all) until he came out, his dad was very anti-gay but he learned to deal with it (they dont' really talk anymore, but knowing his dad, and their relationship he accepted it very well) i wish you the best of luck, and well if it does have negative effects just keep in mind people usually hate or alienate what they don't understand. try to explain to him, especially how it's not your fault what you're attracted to and that you deserve to be happy as every other human being on this earth. btw if basicly your whole family knows i can almost garuntee he knows as well and just isn't saying anything.