Musashi's first adopted son Mikinosuke MIYAMOTO was the third son of Shimanosuke NAKAGAWA, a warrior magistrate of the Mizuno army, adopted by Musashi with his younger brother Kurotaro after the Summer Siege of Osaka Castle.
武蔵の最初の養子宮本三木之助は水野軍武者奉行中川志摩之助の3男で、大坂陣後に4男九郎太郎と共に武蔵が養子に貰い受けたものである。