His real son was Tsunasada KUTSUKI, who served as Army Major General, viscount and a member of Kizokuin (the House of Peers) and was also famous for his research of gunpowder.
実子に陸軍少将・子爵・貴族院(日本)議員を務め、火薬の研究者としても有名な朽木綱貞がいる。