His cousin named Kyle Broflovski (voice actor: Matt Stone) with whom he shares a frenemy relationship. His estranged father, who remains a mystery.ģ. His mother, Liane Cartman (voice actor: Trey Parker), who spoils him endlessly.Ģ. Part 3: Introducing Eric's Families and Voice ActorsĮric Cartman is known for his hilarious interactions with his family members.