King and The Dragonflies by Kacen Callendar

From Scholastic:

But when Sandy goes missing, sparking a town-wide search, and King finds his former best friend hiding in a tent in his backyard, he agrees to help Sandy escape from his abusive father, and the two begin an adventure as they build their own private paradise down by the bayou and among the dragonflies. As King's friendship with Sandy is reignited, he's forced to confront questions about himself and the reality of his brother's death.

The Thing About Jellyfish meets The Stars Beneath Our Feet in this story about loss, grief, and finding the courage to discover one's identity, from the author of Hurricane Child.