He was once adopted as a son of MINAMOTO no Michichika and called himself 'MINAMOTO no Chikahiro,' however, when his father reverted the family names to Oe in June 1216, he followed his father and reverted to his family names of Oe.
源通親の猶子となって源親広と称したが、1216年6月に父の大江復姓に合わせて大江姓に戻った。