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Tatara's grandmother is an elderly lady living along her grandson, Tatara, and his father. The exact relation between her and Tatara's father is unknown, but it would seem logical to assume, taking into account the divorce between Tatara's parents, that she is the mother, not mother-in-law. She has poor eyesight and thus frequently asks her grandson to relate to her the events of her favourite sport, sumo wrestling. She seems to have a liking in stout and portly men.