Hiromoto's eldest son, OE no Chikahiro successively held the positions of Director of the Administrative Board, provincial constable of Kyoto, etc., but he ran away when he took the Imperial Court side and it was defeated in the Jokyu Disturbance, and stayed in Sagae no so, Dewa Province.
長男・大江親広は政所別当・京都守護などの幕府要職を歴任するが、承久の乱で朝廷方に付いて敗走し、出羽国寒河江荘に籠もる。