It's nice to hear about supportive parents. I'm lucky, as well. I'm sure neither of them find the whole thing very comfortable, but I'm sure it's equally not surprising. My mom said I've always been a bit feminine. She even asked me curiously if I wanted to get "the surgery". I said that's something to think about a long time from now, but that I did want to get electrolysis. She also said we could go together to get our eyebrows done, and she gave me a pair of her jeans (Jessica Simpson brand, lol) that don't fit her anymore. Her main struggle is having to call me something other than "son", because that's what I've been to her for 33 years. She said, "I guess I can just call you sweetheart."

But, to those who
do have relatives that aren't supportive (or worse): the way I see it is that family really has nothing to do with who you're related to. Real family isn't about blood, but about mutual love, respect and support. That's how we've treated anyone new who has come in through marriage whether a step-sibling, an elder, or any new offspring.
Anyone who serves as a hinderance to your progress or sanity is someone not worth your time or attention. Real love surpasses how we choose to identify; the rest is conditional and dismissible.
"You are your own sole arbiter." — Aleister Crowley