After the Battle of Okehazama, Ieyasu became independent from the Imagawa family and allied with the Oda family, gave the family name Matsudaira to the three sons of Toshikatsu HISAMATSU and Odai, made them his retainers, and welcomed Odai as his mother.
桶狭間の戦いの後、今川家から自立し織田家と同盟した家康は、久松俊勝と於大の三人の息子に松平姓を与えて家臣とし、於大を母として迎えた。