Beginning his professional career as a child actor at the age of eight, Wiebe is a two-time Young Artist Award winner and five-time nominee. He is best known for his feature film roles in Diary of a Wimpy Kid, as well as the Air Bud series, The Sandlot: Heading Home, 16 Wishes and The Boy Who Cried Werewolf, as well as for his various guest-starring roles on such television series as Sanctuary, Tin Man, Supernatural, Falling Skies, R.L. Stine's The Haunting Hour, and American Horror Story.
Cainan currently lives in Langley, British Columbia. He is the younger brother of Hailey Morgan, who is a local singer and songwriter. Both host a web series called Eikids.
|2013||Tony's Chance||Ryan||Work in Progress|
|2010||16 Wishes||Mike Jensen|
|2010||Diary of a Wimpy Kid (film)||Quentin||Only appeared in the first film.|
|2009||Beyond Sherwood Forest||Gareth|
|2009||Dinosaur Train||Derek Deinonychus and Todd Triceratops||Unknown episodes|
|2009||The Guard||Joshua||Episode: "Out of the Woods"|
|2009||Mr. Troop Mom||Slime Ball Boy|
|2006-2009||Supernatural||Barry Cook, Bully #1, Boy Victim||3 episodes|
|2008||A Pickle||Charlie||short film|
|2008||Robson Arms||Dream Sequence Robbie||Episode: "Gila Monster"|
|2007||Psych Psych||Issac Mendoza||Episode: "Gus's Dad May Have Killed an Old Guy"|
|2007||Tin Man||Kalm||3 episodes|
|2007||The Sandlot: Heading Home||Ryan|
|2007||Masters of Horror||Young Toot||Episode: "We All Scream for Ice Cream"|
|2007||Bratz||Ashton||Episode: "Bratz vs. Brats"|
|2006||Black Christmas||Billy Lenz (5–12 years)|
|2006||Air Buddies||Mud-Bud Boy|
|2006||The 4400||Duncan Germaine||Episode: "Gone"|
|2006||Dead Like Me||Little Boy||Episode: "Send in the Clown"|
- Cainan has played many sports such as gymnastics, martial arts ,and competitive swimming. His interests and special skills also include acrobatics, triathlons, musical theater, singing, guitar, harmonica, ice skating, hockey, and summer sports such as baseball and soccer.
- He wears glasses for reading.