Sueko's elder sister, Kaeko, married the former earl Yorihiro MATSUDAIRA (Riji of Hongo Gakuen), who was the descendant of the feudal lord of the domain of the former Takamatsu.
寿枝子の姉香枝子は、旧高松藩主の末裔旧伯爵の松平頼明（まつだいらよりひろ、本郷学園理事）に嫁いでいる。