Yin

Yin is a resident from the Lower Ring of Ba Sing Se, where her family owns a small fruit stand. She is the mother of San and Tu's father, as well as the grandmother of Bolin, Mako, and Tu.

History
In 171 AG, Yin excitedly greeted her grandsons, Bolin and Mako, after arrived at Ba Sing Se's Lower Ring. Unaware, she inquired about her son and daughter-in-law and was disheartened to discover that they were killed when Bolin and Mako were young.

Yin painfully listened as Tu's father recalled the circumstances which led San to leave Ba Sing Se for Republic City. Following the story, she led Mako and Bolin to a room where she showed them a letter their father wrote, which included a photograph of a young Mako and Bolin along with their parents. Yin expressed her disappointment over never meeting her daughter-in-law, but concluded from how her grandchildren grew up that she was a good woman. She received Mako's red scarf that once belonged to San, as the young firebender stated that his parents would have wanted her to have it.

During dinner, she reprimanded her family members for speaking negatively about Earth Queen Hou-Ting, before blowing a kiss to a portrait in her honor.