Bunny is Oscar's sister. She appears in a Season 41 episode of Sesame Street as a surprise guest for Grouch Mother's Day. Oscar's mother gave her the name Bunny just to annoy her. In April 2011, Oscar answered a couple questions about his sister in the following interview:
|“|| Was your mother also a grouch?|
Oh yes, I come from a long line of grouches. I have a sister, her name is Bunny. Mom named her that just to tick her off. She’d rather have had a name like Geezelah or Grumpy, because she is, trust me, a grump.