Lenny Leonard's sister is the unnamed sister of Lenny Leonard.
History
Every Valentine's Day, Lenny dates Carl Carlson's sister and Carl dates Lenny's sister. They like how they can date someone with their best friend's face.
In "The Burns Cage", Lenny asks for time off in order to attend his sister's funeral. It is unknown whether he was referring to this character or a second, unseen sister. It is also possible that Lenny was lying to get time off.
