However, as the younger brothers died one after another, he adopted Tsunasada KUTSUKI, Michitsuna's son, but disinherited him not only because Tsunasada was in poor health but also he was on bad terms with Taneharu, then he adopted Totsuna KUTSUKI from the Iwamura Domain of Mino Province and retired on December 23, 1728, giving him the family estate.
しかし弟たちが相次いで死去したため、迪綱の子・朽木綱貞を養子に迎えたが、綱貞が病弱な上に不和になったため廃嫡し、美濃国岩村藩から朽木玄綱を養子として迎え、享保13年（1728年）11月23日に家督を譲って隠居した。