Grandpa Jones is the deceased grandfather of Casey and Sid Jones. He used to be a train robber, until he got married and had a dog named Spot. Grandpa Jones hid the treasure he stole. His dog Spot passed away from sickness and Grandpa Jones decided to hide the treasure under Spot's grave. His wife, who never appreciated his past, tried to make up for her husband's sins by giving the stolen money to several charities. Grandpa Jones passed away from an unknown cause and his useless grandson, Sid, became determined to seek out the treasure.