According to "Soseki no Omoide" (literally, Memories of Soseki) by Kyoko NATSUME, Soseki NATSUME's wife, Soseki's father, Kohei Naokatsu, was a superior of Ichiyo's father, Noriyoshi, when the latter worked as an official of Tokyo Prefecture.
夏目漱石の妻・夏目鏡子の著書『漱石の思ひ出』によると、一葉の父・則義が東京府の官吏を務めていた時の上司が漱石の父・小兵衛直克であった。