Yasumori was more or less of the same generation, with a 4-year difference in their age, as the fifth regent Tokiyori HOJO, who was Yasutoki's grandson and Yasumori's cousin.
泰時の孫で泰盛の従兄弟にあたる5代執権北条時頼とは4歳違いのほぼ同世代である。