sentences:  His mother was a daughter of [[Toki Yorinobu]], the "daimyō" of [[Numata Domain]] in [[Kōzuke Province]].He became "daimyō" of Yokosuka and head of the Nishio clan upon his father's death in 1861 and was received in formal audience by [[Shogun]] [[Tokugawa Iemochi]] the following year.During the [[Boshin War]] of the [[Meiji Restoration]], Tadaatsu's retainers were divided as to whether or not the domain should continue to support the shogunate, or join forces with the [[Satchō Alliance]] in support of the new [[Meiji government|imperial government]].