Because Mitsukatsu WAKEBE (the oldest son of Mitsuyoshi) died young, Mitsunobu, who was the son of Masakatsu NAGANO (the husband of Mitsuyoshi's daughter) and Mitsuyoshi's grandchild, came to succeed as an adopted heir.
光嘉の長男・分部光勝は早世していたため、娘婿に当たる長野正勝の子で外孫にあたる光信が養嗣子として後を継ぐこととなった。