Uncle Hank

Uncle Hank is the uncle Oscar the Grouch. He is also the uncle Ernest & Otto the Grouch. Uncle Hank appears in ''[http://muppet.wikia.com/wiki/Sesame_Street_Stays_Up_Late! Sesame Street Stays Up Late!]'', on the party line with Oscar, Mrs. Grouch & Oscar's other Grouch relatives. Whether Hank is the brother of Oscar, Ernest & Otto's mother or their father is still unknown.