However, as his mother was a daughter of Ieyasu TOKUGAWA, Tadasato's younger brother Tadatomo was allowed to succeed the head through the good offices of bakufu (Japanese feudal government headed by a shogun).
しかし、母が徳川家康の娘であるということから、幕府の計らいを受けて忠郷の弟に当たる忠知が家督を相続することを許された。