Nephew: Geronimo Stilton
Niece: Thea Stilton
Grayfur is a seamouse. Almost twenty years ago, he sailed away for the Ratlapagos Islands searching for treasure and didn't return for years, breaking Sweetfur's heart. She still wears a silver, heart-shaped locket containing a photo of him, a note and his whisker. Geronimo says that he must have loved Sweetfur very much, as it is very painful to pull out a whisker.
Twenty years after his mysterious disappearance, Sweetfur and her relatives finally found the long-lost Grayfur, on a tiny island. Grayfur explained to his relatives that he had found the logbook of Admiral Don Sea Snout III, and decided to search for what was left of The Golden Rind. But, unfortunately, his ship sank in a terrible storm. His crew left the ship on a lifeboat, but, as the captain, Grayfur did not abandon his ship and hung on till the very last minute. He managed to cling to a piece of wreckage and was washed up on the beach of an island by he ocean waves. Here, he spent his years surviving on coconuts and fish.
- ↑ Geronimo Stilton #25: The Search for Sunken Treaure https://books.google.nl/books?id=cdmr4WENTLoC&pg=PA104&lpg=PA104&dq=geronimo+stilton+uncle+grayfur&source=bl&ots=_meKKab0V0&sig=ydlQU6m5_OHdxxwWp1hsjAgXURo&hl=nl&sa=X&ei=JSiEVaqMHIa3UbnZgagH&ved=0CCsQ6AEwAQ#v=onepage&q=geronimo%20stilton%20uncle%20grayfur&f=false