It is also supposed that the Shimonokuni family and the Kaminokuni family were each in charge of Ezo kanrei in the northern border with Mutsu Province and the northern border with Dewa Province, respectively.
下国家と上国家は、それぞれ陸奥国北辺と出羽国北辺で蝦夷管領の役割を果たしていたとも推察されている。