A New Level Of Crazy

A teenage boy, and his parents get in a car crash on their way to their lake house. The boy is the only one who survives, and he looses all humanity left, and goes on a killing spree until he finds a demonized mirror in a underwater cave system. He touched the mirror releasing his demon sister Lily, and his half Demon sister Kathrine. They tell him that humans killed his parents, and they need him for revenge.