The Emperor Kogen who is said to be the father of Obiko is also believed to be the grandfather or great-grandfather of TAKENOUCHI no Sukune who was said to be born on the same day as the Emperor Seimu.
大彦の父とされる孝元については、武内宿禰（成務と同じ日に生まれたとされる）の祖父あるいは曽祖父とされる。