Donorboy by Brendan Halpin
Donorboy, a YA novel by Brendan Halpin, is about this girl whose two moms die, and custody goes to her sperm donor. Like that movie from the '80s, Three men and a baby, Donorboy is all about the adventures of this man who inherits a child, this one in her teens, and he's got no idea what's in store. It's told mostly through email messages and journal entries. It touches on LGBT issues, but it's really about this teen's loss, and creating a new family.
I've been quite amazed lately, at the number and quality of YA books with LGBT themes. I don't think this was the case when I was a teen! I still remember Ellen's first TV kiss! Times have changed, for the good.