Mitsutsuna's offspring Mitsushige OIKAWA became a retainer of the Yuki clan in Shimousa Province and was localized in Shimousa, and Mitsushige's offspring Mitsufusa OIKAWA became a retainer of the Shirakawa Yuki clan and obtained territory in Oshu (Fukushima Prefecture) (there is the place name 'Oikawa village' in Kitakata City, which may suggest that there was a relationship with the Oikawa clan in those days, but the birth of the place name was after the Shoo era and previously it was called Nikkuni).
光綱の子孫・及川光重は、下総国の結城氏の家臣となって下総に土着、その子孫・及川光房は白河結城氏の家臣となり奥州（福島県）にも所領を得た（喜多方市に「笈川村」という地名あり、あるいはこの頃の及川氏に関係あるやにも思われるが、この地名ができたのは承応年間以後のことでそれ以前は新国（にっくに）といった）。