The Serpent King by Jeff Zentner

Meet Dill, grandson of the Serpent King and son of the preacherman caught with child pornography on his computer and sent to prison, in part by Dill himself. Suffice to say, Dill's life isn't the easiest. Dill has had to wrestle with vipers his whole life—at home, as the only son of a Pentecostal minister [...]