Patcheye the Pirate is Popeye's great-grandfather, a character first introduced in comic books in 1963. Once a fearsome pirate captain, he continued to exist in his ghostly form, trapped in a treasure chest until freed by Poopdeck Pappy and Swee'Pea. Since then, he has come into conflict with his great-grandson, whose contempt for pirates is only matched by his dislike of ghosts.
Patcheye greatly resembles Poopdeck Pappy and Popeye, albeit with a black beard and pirate captain garb. He also sports a pegleg and an eyepatch.
If Patcheye was Pappy's maternal grandfather, that would make him the father of Granny.