Bobby is named after his grandfather, Bob. Bob helps Bobby learn to walk, teaches him to build a block tower, and tells him stories. One day Bobby comes home and his grandfather isn’t there. Bobby’s parents tell him that his grandfather is sick and he doesn’t remember who anyone is. At first Bobby is scared, but when he builds a block tower for Bob the way they used to do together, he knows that his grandfather remembers him. Slowly Bob starts to get better, and then it’s Bobby’s turn to teach his grandfather something important.