A Heartwarming Story on the Importance of Family TiesCaillou is disappointed when his friend Sarah gets sick and can't come over to play. To cheer him up, Daddy tells him the story of a great knight who protects his kingdom from a terrible dragon with a little help from his family making good use of their science and engineering knowledge to come up with a crafty solution. Caillou learns that families can be a person's best friends and allies. Caillou learns that families can be a person's best friends and allies.