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Uncle Billy

Uncle Billy as seen in How to Be a Grouch.

Uncle Billy is the uncle of Oscar the Grouch. He is also the uncle of Ernest the Grouch & Otto the Grouch. Like Oscar's father & Otto, Uncle Billy is never seen in any Sesame Street episodes. He is only mentioned in the 1976 book How to Be a Grouch, along with a few of Oscar's other relatives. Whether he is the brother of Oscar's father or mother is unknown.

See also