However, Nobukazu MATSUDAIRA of the Fujii-Matsudaira family which was the same family line as the Matsudaira clan had no child, so Nobuyoshi, who was a nephew of the lord, Ieysu TOKUGAWA was adopted into the Fujii-Matsudaira family.
ところが、同じ松平氏一族の藤井松平家の松平信一が子供に恵まれなかったために、主君・徳川家康の甥にあたる信吉が養子に迎えられる事になった。