Charlie Swan
"Charlie and Renee were not married for very long. Their daughter, Bella, was born in September of 1988 and they were divorced by March of 1989. The fact that Charlie didn’t follow Renee when she left was about so much more than a job. Charlie’s parents were both still alive, but just barely, when he and Renee met. He was responsible for caring for them. He didn’t choose Forks, he chose his responsibility to his sick parents. Although he has now been divorced for seventeen years, he has never really gotten over his ex-wife. When she was little, Bella would come to visit for one month in the summer. When she was fourteen, she put her foot down and required vacations elsewhere with her father. They usually went to California. When Renee remarried, Bella felt the need to give her mom some time alone with her new husband and went to live with Charlie in Forks. Charlie did everything he could to make Bella feel at home, even buying her a car."
Renee Dwyer
"Renee and Charlie were not married for very long. Their daughter, Bella, was born in September of 1988 and they were divorced by March of 1989. She moved to Riverside, California until Bella was five years old, at which time she moved to Phoenix, Arizona where she still lives today. Around 2004, she met and fell in love with a minor league baseball player named Phil Dwyer whom she later married. It was difficult for them to spend time together as he was always on the road and she had to stay home to be with Bella. Bella opted to move in with her father, freeing up Renee to travel with her new husband. She is described as being the child in the relationship rather than the adult, in spite of her age. She is a free spirit and often times forgetful."
Isabella Swan
Bella was born on September 13, 1987 to Charlie and Renee Swan. "Bella was born in Forks, but her mother and father split up when she was six months old. She spent the majority of her young life in California and then later Phoenix, Arizona where she wasn’t very popular and never felt as if she fit in. She is far too clumsy for her own good and tries to avoid sports and dancing. When her mother remarried, Bella decided to move back to Forks to live with her father. She felt a bit guilty that her mother wasn’t able to spend as much time traveling with her new husband because of her, and so willingly, but not enthusiastically, she moved in with her dad. He bought her a truck and has tried to make her feel comfortable in her new home."
(Thanks to Twilight Lexicon)