Here's the thing; it's one thing to hide your sexuality, but if you're already taking steps to transform your gender... They're going to notice soon, anyways.

I think that the best thing to do would be to sit down with your most rational, close family member. Explain it to them, and then have them explain it to the rest of your close family with you. If you can get one person to hold your hand and be on your 'side,' the others will probably be more open to the idea and you'll be less worried.

While they may seem against it, it's probably just going to be more shocking than anything else. Could you imagine the son you raised, coached into a fine young man, and saw through school... Suddenly becoming your daughter? It's gonna be a big surprise, and they'll probably take a few weeks (if not months) to come to terms with it, but if they love you they'll accept you as your new gender and for who you are.

Also, never let them tell you that your feelings are wrong. Scientific basis or not, religious basis or not, personality traits present or not... You're the only one who knows how you feel, and if you feel you were born into the wrong body, they can't tell you that you DON'T feel that way or that you just don't understand how you're feeling.

Usually physicians require you to go through counseling before starting hormone therapy, too, so you can always talk about how you HAVE seen a professional whose whole job is to help you figure out if you're making the right choice.

Good luck!

That's great to hear! Let us know how it goes! I bet that it will end up going better than you're expecting.