Clarabelle Cow's sibling is an anthropomorphic cow of unknown gender.
This person is the sibling of Clarabelle Cow. He or she married at some point of their life and had at least one daughter, Itsy-Betsy. In 1969, Itsy-Betsy's parents sent their daughter to live Clarabelle Cow for a small while.
Behind the scenes
This sibling's existence was implied in the 1969 story Triple-Sitter Trouble.