Tomonari SUMITOMO's younger brother, Moto SUMITOMO, married Sueko, the seventh daughter of Earl Tadaie SAKAI, who was the feudal lord of the domain of the former Obama (14,000 koku).
弟の住友元夫は、やはり旧小浜藩十万四千石の藩主酒井忠克（さかいただたえ）伯爵の七女寿枝子を娶っている。