His brother, Kanzaburo NARUISHI (February 5, 1880 - January 3, 1931) who engaged in the sales business of general merchandise, was also arrested for Kotoku Incident (also known as Taigyaku Jiken [the High Treason Incident]); his death sentence was reduced to life imprisonment after the trial, and later he was released on parole in 1929.
兄で雑貨商の成石勘三郎（1880年2月5日-1931年1月3日）も大逆事件で逮捕され、死刑判決後に無期懲役となり、1929年に仮釈放。