Uncle Billy

Uncle Billy  is the uncle of Oscar the Grouch. He is also the uncle of Ernest  &  Otto the Grouch  & their sister  Bunny. 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  grouchy   relatives. Whether he is the brother of Oscar  's  father  or  mother  is unknown.

Books

 *  How to Be a Grouch  ( 1976 )