Dazai no Daigen (Senior Inspector of Dazai-fu) Taneo HARADA was his father; his wife was an adopted daughter of Naidaijin (Minister of the Interior) TAIRA no Shigemori (his uncle TAIRA no Iemori's daughter).
父は大宰大監原田種雄、妻は内大臣平重盛の養女（叔父平家盛の娘）。