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Jeffery is a 4 year old who is one of Caillou's friends . He has a twin brother named Jason. Jeffery and Jason weren't around in Season 1. Their first episodes that they appeared in were in the season 2 episodes New House, New Neighbors and After Dark, which were made right at the same time. Back then he and Jason both wore identical clothes (red shirts with a white stripe and pants) but, in Season 4 Jason began to wear a white shirt with a red stripe and they are now able to be told a part. Jeffrey loves cooking pizza. Towards the end of Season 2 he and Jason began coming to to Caillou's playschool class. In Seasons 2 and 3, he and Jason appear to be mischievous and sometimes a little mean to Caillou but, in Season 4, they are nicer to Caillou and more of kind people. He is voiced by Alex Mover.


  • New House, New Neighbors
  • After Dark!
  • Garage Sale
  • Snow footprints
  • Xavier's Birthday
  • Playschool 
  • Something for everyone
  • Caillou the chef
  • Caillou of the antarctic
  • Where I saw it last
  • A surprise for Ms. Martin
  • Caillou goes tobbogining

Note: Although Jason in Jeffery are twins Jason doesn't appear in the episode Garage Sale and Jeffery doesn't appear in the episode Jason appears in, A Surprise for Ms. Martin.

Caillou's Playschool class
Caillou Clementine Emma Jason Jeffery Leo Xavier