Born into a Jewish family in New York, Francine "Fran" Joy Fine is the second and youngest daughter of Sylvia and Morty Fine. She was raised in a neighborhood in Queens, New York called Flushing along with her older sister Nadine.

In her teens, Fran and her best friend Valerie Toriello attended local Hillcrest High School, alongside fellow students Ray Barone, Fran's arch-rival, Heather Biblow, the late actress Morgan Faulkner, and taxicab driver wannabe playwright Jeffrey Needleman.

Fran in the series is shown as a bubbly, outgoing, humorous, and sexy character where she gets herself into trouble on a number of occasions but ends up solving the problems. Upon graduating, Fran attended cosmetics college while working as a part time foot model. She later assisted in her then-fiancé Danny Imperiali's bridal shop in Flushing, until she was dumped by Imperiali who immediately replaced her with Heather Biblow. Not only did Heather steal Fran's job, she even married Danny and they had a baby together.

After being fired by her ex-fiancé Danny, she then goes door-to-door selling cosmetics. She knocks on the door of theatre producer Maxwell Sheffield who's a widow and lost his wife Sara Sheffield and is looking for a nanny for his three children Maggie Sheffield, Brighton Sheffield, and Grace Sheffield. She is hired in as their nanny and brings what the Sheffield household what they desired the most; love and affection.