Grandpa Joe is one of Charlie's four bed-ridden grandparents. He is usually stubborn, senile, and paranoid, but still kind, caring, grandfatherly, excitable, and supportive. He tells Charlie (and the reader) the story of Willy Wonka's chocolate factory and the mystery of the secret workers. When Charlie finds the Golden Ticket, Grandpa Joe leaps out of bed in joy, and later accompanies Charlie on the factory tour. In the sequel book, Grandpa Joe accompanies Charlie, Willy Wonka, and all members of Charlie's family in the Great Glass Elevator and assists the rescue of the Commuter Capsule from the Vermicious Knids. Grandpa Joe's age is given as "ninety-six and a half" in "Charlie and the Chocolate Factory", making him the eldest of Charlie's grandparents, but in the musical it is stated he is almost ninety and a half.

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