"Five children" generally refer to the essential elements pursued by successful people in present-day society: car, child, house, money, wife. In this image, it refers to a modernized and scientifically developed society. The "five sons" were first mentioned in the Song shi (History of the Song Dynasty, 宋史) at the five sons of Dou Yujun 窦禹钧 (Yi, Yan, Kan, Yan, and Xi 仪、俨、侃、偁、僖) who successively passed the Imperial Examinations.