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Otto the Grouch

Otto the Grouch as illustrated by Caroll Spinney.

Otto the Grouch is Oscar the Grouch's baby brother. He's also the baby brother of Ernest the Grouch & Oscar's sister Bunny, making him the 3rd son of Mr. & Mrs. Grouch. Otto is seen & mentioned in the 1976 book How to Be a Grouch.

See also

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