Lila

Lila Miller is the daughter of Sophia and Sebastian, and the sister of Ben. She is currently deceased in the story but has been mentioned many times. In the fourth boo k, it is revealed by Ben that she had died long before the story was set because she was murdered by someone unnamed at the time. Later in the story, they discover that Jake, Lila's ex, had been madly in love with her and tried taking her blood so that they were together no matter what happened in the future. Instead, Jake accidentally killed her, and tried the same thing with Ben, also killing him in the process.