The only three credited Muppet performers who appeared in Hey Cinderella! were Jim Henson, Frank Oz and Jerry Nelson.
Jim performed Kermit and King Rupert.
Jerry Nelson performed Featherstone and one of the two step-sisters.
Frank performed the second step-sister, though I'm not sure about Rufus and/or Splurge.
But what I'd like to know is what were the names of the two step-sisters? The Stepmother shouts their names in the first domestic scene we have, right after the Fairy Godmother's first attempt to produce the pumpkin coach.
If anyone can help me out, please post the step-sisters' names here or send them to my E-mail. Thanks and have a good day.