Any voice part (best fit for Soprano or Mezzo-Soprano). Stepsisters are cruel, loud, and have big personalities. Their treatment of Cinderella is to help them feel better about how they look. The two princesses are only around for one line, and are very meek and delicate as they say it. 

***NOTE: Alright, here's the deal. If needed, I will split this into two roles: Florinda/Snow White and Lucinda/Sleeping Beauty. HOWEVER, I thought it'd be funny if it was all played by one actress. So this one requires more acting and clear voice differences between specifically Florinda and Lucinda. I also want to be as effective as possible with casting, another reason why to give all four of these smaller roles to one actress.