In the early Kamakura period, the clan split into the Mibu family, the descendants of OZUKI no Takamoto, and the Omiya family, the descendants of OZUKI no Hirofusa.
鎌倉時代初期に小槻隆職子孫の壬生家壬生家（小槻姓）と小槻広房子孫の大宮家大宮家（小槻氏）に分裂。