When Caillou, Rosie and Mom head to the big park, Caillou sees André and they decide to build a snow fort. It is not easy but Caillou likes to learn from André and they put a lot of effort into building it. Sarah shows up and the boys put the fort to the test as they start a fun snow fight. In the end, they decide that the fort could be higher and everyone pitches in to help. (thetvdb.com)