Tomoito's son, the sixteenth-generation kichizaemon Tomonari SUMITOMO, was also a Araragi-ha poet and was on close terms with Mokichi SAITO and Jun KAWADA (who was also an executive at the Sumitomo main office).
その子十六代目吉左衛門住友友成はアララギ派の歌人でもあり、斉藤茂吉、川田順（住友本社の重役でもあった）とも交流があった。