Their mothers were all from the Fujiwara clan or related family who were empress or received similar treatment, and due to the wishes of Kanmu, they all had wives that were Imperial Princesses and their half-sisters with a different mother (Ate had two wives, Imperial Princess Asahara and Imperial Princess Oyake, Kamino had Imperial Princess Takatsu, and Otomo had Imperial Princess Koshi).
彼らはいずれも皇后もしくはそれに準じる待遇を受けた藤原氏藤原式家出身の女性を母とし、さらに桓武の意向で異母姉妹にあたる内親王を妻としていた（安殿は朝原内親王と大宅内親王の2人、神野は高津内親王、大伴は高志内親王）。