Teen Wolf You and Theo are dating. You and Theo got into a relationship a year ago. You guys live together. (You’re 18 so you moved out, but you’re still really close with your dad) Everything is good. Until a new kid shows up. Elena Styll. Elena is your half sister. Same mom, different dad. Your mom left when you were five. She got a husband and a child. That child being Elena. Recently Elena’s parents died and is moving in with your dad. Elena has an immediate obsession with Theo. Theo tried to push Elena away, but she doesn’t seem to take the hints.