The Other Swan
After Renee left with Bella, Charlie was distraught. He ended up having a drunken one night stand. The woman, wanting nothing to do with the baby, pawned her off on Charlie as soon as she could. Not wanting to make another mistake, Charlie kept the baby and raised her.
He named her Khaleesi, after Daenerys Targaryen from George R.R. Martin's Fire and Ice series. Just like it's described in the book and tv show, Khalessi was born with white-blonde hair. She was born with blue eyes, but they soon faded to a weird purple. When Bella moves to Forks, she's shocked on how much difference there is between her and her sister.