His family was a branch of the Sasaki clan (also known as the Kyogoku clan) which was descended from the Uda-Genji lineage (descendents of Emperor Uda who had been given the surname Minamoto) and belonged to the Amago clan.
家系は宇多源氏の流れを汲む佐々木氏（京極氏）の支流で、尼子氏の一門である。