Sean Stevens

Sean Stevens is the baby brother of Chase.

His existence is first alluded to in Un- Separation Anxiety when Chase tells Abigail that her father loved his 'children,' before going on to tell her that her baby brother was born just prior to her disappearance.

Sean is first seen as a baby in Once Were Mortals when the Nevlaks cause Chase and Stacey to believe that their lives as they now know them never happened, leaving Chase a big sister, unaware of her double's existence.

Sean is next seen in the Jace Stevens Trilogy stories Blondes Can Be Deadly and Retaliation when Jace Stevens travels to Chase's home universe and kills her family. He is the only survivor from Chase's original family, and from that point on is believed to be the twins' baby brother.