Hello and welcome! We love allies. I only wish my brother would be half as supportive of me as you are of your sisters. I can only hope some day he learns that it really is not a choice. It sounds like you have some pretty good gay genes in your family! If it was not for people like you, straight allies, we would not be as far and understood as we are now. Thanks for joining our fight.
Don't be afraid, it's only love!