jacob explains how his mom died in breaking dawn . . when he is waiting to know if bella is gonna become a vampire or died on her honeymoon. . . he was too young to remember all of it but he said she died in a car wreck and her casket was nailed shut so no one could view her body thats why jacobs sisters left la push and never returned cause they were older and couldnt handle it but rachel did come back and paul imprinted on her .. .