Bert's family.
Unseen[]
- His sister, who "can draw a llama better than that," was referenced in a season 1 sketch
- Aunt Matilda
- Aunt Coleta
- Uncle Ollie (mentioned in "Kin Folk")
- Uncle Louie (mentioned in Sesame Street Sing-Along!)
- Uncle Bart
- Uncle Rudolf
- Mountain Mike
- Grandmother (visits her in a sketch)
- Grandma Bottle
- Cousin Bubbles Cousteau (mentioned in 1-2-3 Imagine!)
- Cousin Bertha (mentioned in I Want to Be a Pilot)