Caillou learns that being a part of a family is something very special. Dad lends Caillou his old camera and helps him take pictures of every member of their family — including Gilbert. Looking at the photo album, the family remembers when Gilbert was a kitten and first came to live with them. When Caillou and his family go to the zoo, Caillou is thrilled to see that animals have families too. Meanwhile, Rexy is heartbroken when he discovers he doesn't have a family or any papers. Teddy and Gilbert decide to draw up official papers and adopt Rexy, who is thrilled to have a family just like everyone else. In order: Say Cheese, A New Member of the Family, Caillou and Daddy, Caillou Goes to the Zoo (thetvdb.com)