Korechika had siblings of the same mother: empress to Emperor Ichijo, FUJIWARA no Teishi; Chunagon (vice-councilor of state) FUJIWARA no Takaie; Komatsu Sozu Ryuen; nyogo (consort) of Emperor Sanjo from Crown Prince, FUJIWARA no Genshi; the third daughter of Michitaka (wife of Imperial Prince Atsumichi); and the fourth daughter of Michitaka (mikushige-dono (mistress of wardrobe) of Emperor Ichijo (the fourth daughter of FUJIWARA no Michitaka.))
同腹の弟妹に、一条天皇皇后藤原定子・中納言藤原隆家・小松僧都隆円・三条天皇東宮女御藤原原子・道隆三女（敦道親王室）・道隆四女（一条天皇御匣殿(藤原道隆四女)）らがいる。