In The Sims 3, Bianca is on the third day of the Child life stage. Just the day before, her mother, Diana, and older sister, Alice, died in a house fire. But the house was rebuilt and her father remarried. Her stepmother was a nice woman named Rosa and the two bonded instantly. Her grade is an A+. She loves to study, yet she also likes to have fun.
In The Sims 2, Bianca is still alive and lives alone in a small house. Her neighbors treat her like family and wish for her to retire, but she still insists on working. She has very high relationships with the Goth children and acts like a mother to Cassandra and Alex, though she is enemies with Mortimer.
In The Sims, she lives in the same small house and she is a young woman fresh out of college. As her bio explains, many single men have found her appealing, yet she rebuffs them. She adopts her three children during this time. This is where she starts her career in Science.