Jack has a grumpy grandpa, and he calls him that, even though he's not supposed to. But it's true. Grandpa is grumpy--and a little scary, too. He has hair where other people do not have hair, and his teeth don't stay in his mouth. You'd have to be crazy to live with Grandpa . . . or as brave as a lion tamer, like Jack's aunt and uncle. But the truth is, Grandpa didn't always have hair and teeth in weird places. In fact, Grandpa wasn't even always...