Grandpa Grouch
From Muppet Wiki
Grandpa Grouch is one of Oscar's grouchy relatives on Sesame Street.
In Season 15, he was a recycled version of an older Oscar puppet (a version that had moving eyes in addition to his eyebrows), but in Season 18, he was made from a background Grouch. Whether Grandpa Grouch is Oscar's paternal or maternal grandfather, or wed to Granny Grouch, is unclear.
