In cases where the Crown Prince has his own imperial princes, his eldest son becomes the Crown Prince when his father is enthroned, but imperial princes other than the eldest son do not necessarily establish an independent Miyake at the time of their father's enthronement.
皇太子に親王が存在する場合、長男は父である皇太子の即位に伴って皇太子となるが、次男以下の親王は父の即位と同時に直宮家を創設し独立するわけではない。