The child of a friend has come out as transgender. The letter that the parents wrote brought tears to my eyes. I do not have permission to post it here, but to paraphrase: we love our child. Our child's choice of gender does not limit or change that love.
What the letter did contain, that I can repost here, is a set of links for people who want help with accepting and supporting transgender people of all ages:
The parents end the letter with a reminder that a question that would make you uncomfortable, will likely make a transgender person uncomfortable. That holds for questions you would ask of anyone.