Caillou's mom is sick. So Caillou is put in charge of watching over Rosie while she has a nap. Unfortunately, Rosie got out of control and started scribbling on the walls. Caillou tries to stop her, but fails. Caillou's mom then wakes up and sees the mess. She's disappointed with Caillou, but helps him clean up anyway. (thetvdb.com)