Books for a transgender 14 year old?

My little sibling came out to me as a trans female this year. They’re 14 and is in their first year of highschool. What’s a book that might be good for them to read? I know this post is kinda vague, but for a christmas gift i always like to give them a book or two. And since they’re kind of learning more about themself and discovering their identity, i thought this would be a nice idea.

Also im the only one in the family they’ve come out to though, so maybe not a book called like “Transgender teens 101” lol. I don’t want to out them to my family either.

Thanks 🙏