It’s Grouch Mother’s Day, which means Oscar’s mother and his sister Bunny are visiting Sesame Street! Who will give Mrs. Grouch the stinkiest, yuckiest gift—Oscar or Bunny? Will Mrs. Grouch’s day be ruined enough to be considered a success? Also in this episode: Rachel Griffiths teaches the word “dozen” by showing 12 eggs, bagels, and penguins. Brought to you by the letter Y and the number 12.