What is the name of Francine's older sister?

Francine’s older sister is Catherine Frensky. She is a high-school student in the Frensky family and is portrayed as more mature and independent than Francine.

Catherine is interested in teen magazines, enjoys horseback riding, and sometimes babysits for Arthur’s family. Her relationship with Francine is affectionate but not always peaceful: the sisters argue over ordinary family matters, while still clearly caring about one another.

Catherine’s family connections help place her in Elwood City’s wider social world. Her parents are Oliver and Laverne Frensky, and Oliver works as a sanitation engineer for the city. Catherine is also older than Francine by enough to occupy a noticeably different stage of childhood, making her a useful contrast to Francine’s energetic elementary-school personality.

A common mix-up is choosing Muffy Crosswire, one of Francine’s close friends, or Nadine, D.W.’s imaginary friend. Bitzi Baxter is another recurring adult character, but she is Buster Baxter’s mother, not a member of the Frensky family.