In 1876, his 14-year-old daughter Kondō Tama married his nephew Miyagawa Yūgorō, who succeed him as a fifth generation master of Tennen Rishin-ryū and renamed as Kondō Yūgorō, established his own dojo Hatsuunkan in Kami-ishihara (present day Chōfu, Tokyo). Tama and Yūgorō only child, a son Kondō Hisatarō, was born in 1883. Kondō Tama died three years later in 1886 and Yūgorō was later remarried at least two times.

In 1905, Kondō Hisatarō was killed in action in the Russo-Japanese War at the age of 22, marked the end of the Kondō Isami bloodline.[29]

https://en.wikipedia.org/wiki/Kond%C5%8D_Isami