Grandpa Joe Bucket is a 96 year old character in the book Charlie and the Chocolate Factory. He is the grandfather of Charlie Bucket. Grandpa Joe is notable for his great knowledge of Willy Wonka and his factory.
History (will contain spoilers)
Grandpa Joe was born in January 7, 1867 and married Grandma Josephine Bucket in March, 1885 and gave birth to William Bucket his only son in June 22, 1929. All four had not been out of their bed since 1946
This changed when Charlie his only grandson found his Golden Ticket, and Grandpa Joe was so excited that he jumped out of bed and did a dance. He went with Charlie to the factory and they took the whole tour, until Charlie was the only child left who didn't fall victim to a seemingly dangerous accident.Joe is often excitable, paranoid, stubborn and anxious that Charlie wins the contest. He takes his relationship with Charlie very seriously. Joe is also angry when Wonka dismisses Charlie without reward due to their theft of the Fizzy Lifting Drinks, He then cheered up and suggests to Charlie that he gives the gobstopper to Slugworth in revenge. He also says that he expects Charlie to find all five Golden Tickets and stubbornly expects Charlie to find one when he and Grandpa George give a Wonka bar to Charlie for his birthday. He mentions to Charlie that he used to be an employee at Wonka's factory when he was younger before Wonka had to close the factory and lay off all its employees. When Joe and Wonka meet again, Wonka questions if Joe had been one of the spies, and when Joe replies that he never was one, Wonka welcomes him back.
While here, he purposely stole, although this can be excused by the fact that food was scarce in the family. After this, Charlie, Grandpa Joe, and Wonka all went inside the Great Glass Elevator and Wonka pressed the Up and Out button to send the elevator through the roof of the factory and flying in the air to go and gather Charlie's family, because Charlie had won the factory.