A member of the Soga clan, a distinguished clan in ancient and medieval Japan, SOGA no Yasumaro was a son of SOGA no Murajiko, a brother of SOGA no Shoshi (who became a lawful wife of SOGA no Fuhito), and the father of ISHIKAWA no Iwatari.
古代の名族・蘇我氏の出身で、父は蘇我連子、姉妹に藤原不比等正室となった蘇我娼子、子に石川石足がいる。