The title of this article is conjectural. Though the topic is found within The Simpsons universe, a proper name is not available.

Carl Carlson's sister is the unnamed sister of Carl Carlson.


Every Valentine's Day, Lenny dates Carl's sister and Carl dates Lenny Leonard's sister. They like how they can date someone with their best friend's face.

However, in "The Saga of Carl", when Carl went to Iceland to see his adoptive parents, no siblings were shown or mentioned. Therefore, Carl's sister was either adopted by someone else, lived with her biological parents or lives in Springfield.


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