Leslie's Brother-in-law (Sister's Husband)

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This unnamed man is the husband of Leslie Winkle's sister.

He is indirectly mentioned in "The Cushion Saturation" where Leslie mentions to Howard while they're in Howard's bed together in his bedroom at his house that her sister is getting married and that Leslie needs someone to accompany her to the wedding as her date, to which Howard appears to agree to do so.

Trivia

• It is possible that this person could also be a woman, as Leslie never mentions a husband, since all she says is "My sister's getting married".