Tameyoshi, Tametomo's father, was invited to serve as Taisho (general) by the Retired Emperor Sutoku, and although he initially tried to refuse, citing his advanced age, he was forced to accept the invitation and presented himself with six of his sons, including Yorikata and Tametomo, at Retired Emperor Sutoku's Shirakawakita-dono Palace.
父の為義は上皇方に大将として招かれ、老齢であると固辞したものの遂に承諾させられ、頼賢、為朝ら6人の子を引連れて崇徳上皇の御所白川北殿に参上した。