After Kagemori, Tokinaga's elder brother, became a priest and his legitimate son Yoshikage ADACHI succeeded reigns of the Adachi clan, a branch family named Oosone as myoji was established by the son of Nagayasu.
兄景盛の出家後、その嫡子安達義景が安達氏の家督を継承して以降、時長の子長泰から大曾禰を名字とした分家が成立した。