From Muppet Wiki

A list of Muppet nieces, both on screen and in books. In the case of long-running characters, the source listed is the character's first appearance.

Baby Monster

• Cookie Monster, uncle -- Cookie Monster's Storybook

Irvine the Grouch

• Oscar the Grouch, uncle -- Sesame Street

Ojo

• Uncle Koala -- Bear in the Big Blue House, Episode 109: What's in the Mail, Today?

Roxie Marie

• Biff, uncle -- Sesame Street, Season 23

Zoe

• Aunt Chloe -- Sesame Street
• Aunt Giselle -- Sesame Street

See also

• Muppet Relatives for a complete listing of Muppet families