Jerkbait, by Mia SiegertRead about another book on the list.
Robbie and Tristan haven’t been close since they shared a womb, but when Robbie attempts suicide, they have no choice but to share space in order to keep him safe. Now that they’re sharing a room, Tristan finally sees there’s more to his hockey star brother, including the toll that being closeted has taken on him as he considers the ways it may limit the future in pro sports everyone has always imagined for him. Robbie’s finds his only solace in an online stranger, but when even that turns into a dangerous secret, Tristan may have to put his own future on the line to save the brother he’s only just getting to know.
Also see Francesca Haig's top ten list of the greatest twins in children’s books.