Who is Fortunato "Chick" Binewski from Geek Love and what is their importance?

Fortunato is the youngest of the Binewski children, Chick is the most powerful child but also the most sensitive. He does not have the vicious feelings that his brother Arty has and easily becomes a pawn under Arty's schemes. He is manipulated by both his father and Arty throughout his life. They treat him poorly and only see him as a means to an end. They never capitalize on the inherent gift that his telekinetic skills are. He is taught only to cheat at poker, become a pickpocket or aid in the surgery of chopping off the limbs of Admitted members of the Arturan cult. For a child with so much to give, he instead spends most of his life in the operating room of a sham surgeon as that is what Arty wishes.