Billy is Clementine's older brother . He occasionally appears in episodes with Clementine. Billy's age isn't known, but he appears to be at least 12 years old. One of his hobbies is playing the drums. He has the same as Rosie's eyes.
- Dogs with Jobs
- Caillou goes Strawberry Picking
- Zoo Garden
- Sarah's School
- Caillou's Music
- Caillou Plays the Drums
- Caillou Shoots! He Scores!
In the episode Sarah's School he is seen in elementary class, meaning he is around 10 years old. Then, in the episode Caillou's Music he is in the marching band, meaning he would be a little older.