"No? What kanji does her name use?"
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Nishikado (西門,Nishikado) was the wife of the former tea master of the Nishikado family. They had three sons together, including Shoichiro and Sojiro.
She had three sons, Shoichiro, Sojiro, and one unnamed with her husband. Her husband was the tea master of the Nishikado family, until his son took over. She appeared to be aware of her husband's infidelity.
Tsukushi Makino described Mrs. Nishikado as "very beautiful, but she seems a little cold". Her dark hair was always put up and she was never seen not wearing a kimono.