Inevitable and Only by Lisa Rosinsky
Fifteen-year-old Cadie’s life is turned upside-down when her father reveals that she has a half-sister, Elizabeth, who is only a few months older than Cadie. Not only that, Elizabeth’s mother has just died, so now Elizabeth will move in with Cadie’s family. Learning about a half-sister is one thing, but sharing a family with her is a whole other challenge.