Annabelle Swan is Isabelle Swan's younger sister who moved to Forks when she was 5 and Bella was 7. At age 16 Anna gave birth to a baby boy who she named Isaiah. Two weeks after giving birth her older sister moves to Forks.
Lucifer Swan is the younger 15 year old brother of Isabella Swan. Lucifer is smart for his age so instead of being in 10th grade he is in 12th grade. Bella has never hated Lucifer but the siblings have not gotton along since the start of middle school (6th grade) . Now they are both moving in with their father.