Margaret Kane, 27, is Connor's half-sister who runs a computer consulting business. When Margaret was Connor's age, their father Kane left Margaret's mother for Connor's. Margaret remains chilled by the experience. Connor's parents are not friendly with her, but they welcome her care for Connor after school and sometimes late into the night. "Call your mother and tell her you're having dinner at the Evil Empire," she says to him one evening. Eventually she resorts to Dad's expertise as University Registrar Kane, regarding the Zamborska case; that and some prodding by Connor effect some warming between daughter and father.