Not much is known yet about Jughead's mom and sister, who don't live in Riverdale. But they'll be playing a bigger role in season three, since Gina Gershon and Trinity Likins were cast as Gladys and Jellybean. Of course, it would be great if Jughead's family members weren't involved with the creepiness that is the Gargoyle King. But if they were, it would make sense: They're total mysteries right now, and it would explain why Dilton went to Jughead about the situation.