Isabella isn't the only Swan sister. She has a little sister that is 6 months younger than her (Charlie cheated on Renee when he was drunk) however her mother died during childbirth so Renee took her when she left with Bella.
Isabella isn't the only Swan sister. She has a little sister that is 6 months younger than her (Charlie cheated on Renee when he was drunk) however her mother died during childbirth so Renee took her when she left with Bella.