Who is Uncle Jolyon from The Game and what is their importance?

Uncle Jolyon is the patriarch of the family, most of whom are afraid of him and his potential punishments for disobedience. Because it is prophesized that Hayley will have the power to stop him, he imprisons her parents and sends her to live with her grandmother, who is under strict orders to keep her away from magic and the mythosphere. In Greek mythology, Jupiter (Uncle Joylon) is the chief God. He is also known as Zeus.