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Uncle is to aunt as father is to mother.
"Aunt is teaching uncle how to cook."
Tio
Uncle Fester was a member of Gormez Addams side of the family; he was a brother to Gormez and a uncle to Morticia, Wednesday and Pugsley Adadams.
In Sanskrit, the word for uncle is "मामा" (māmā) which refers to mother's brother, and "पितृ" (pitṛ) which refers to father's brother.