Shige Yamano, maternal grandmother of the Yamada family and mother to Matsuko, anchors the household with a wit as sharp as her observations. Her surname—a fusion of "mountain" (山) and "field" (野)—echoes her grounded, unflinching connection to nature and tradition. As matriarch, she weaves advice and proverbs into daily life, tempering domestic disputes with pragmatic wisdom. Her humor surfaces in mundane chaos, like quietly savoring the absurdity of her daughter and son-in-law’s squabbles over chores.

Playful friction defines her bond with Matsuko, particularly during kitchen clashes where Shige’s attempts to master elaborate recipes—often stumbling over foreign dish names—expose generational quirks. Yet beneath her sarcasm lies resilience, a trait mirrored in moments where she contemplates aging, such as visits to ailing friends. These reflections, punctuated by haiku that thread scenes together, underscore life’s fleeting beauty without softening her blunt honesty.

Her lessons sometimes spiral beyond intent: rewarding neighborhood children with a "found" baseball unravels when its rightful owner emerges, blending irony with moral nuance. Though her past remains unspoken, Shige navigates familial tensions with a balance of stern authority and subtle warmth, her presence a quiet testament to bonds forged through shared strife and the unspoken poetry of ordinary days.