Ella Enchanted author Gail Carson Levine said of Cinderella’s Stepsisters, “If I had been around when “Cinderella” was first concocted, I would have argued against two stepsisters. We don’t need two! In the fairy tale they’re indistinguishable.” Indeed they are. Groupings of three are common in fairy tales. Cinderella’s stepsisters function to provide two failed …