Lois' Aunt Esther is mentioned in "'Twas the Night Before Mxymas," but Clark never mentioned having an aunt. (I downloaded the transcripts and used Vista to do a search of them on the word "aunt".) Well, Clark did mention that the hypothetical "loved one" whose funeral he and Lois were allegedly planning was his uncle; but since that was just a cover story, I hardly think that that counts.
cheers,
Lynn
