Accordingly, Iemasa merged the seven vassal families with the five main retainer families and named them "Taishinshu" (literally, people of high rank), and decided that five or six families out of twelve families alternately attend to governmental affairs every month; 12 families cooperatively deal with emergency situations.
そこで、族臣7家と老臣5家を合一し『大身衆』と呼称変更させた上に、その12家の中から5、6家が毎月交代で国政を担当し、有事には12家が協力して対応するように改めたのである。