He made his older sister, Risshi KUJO, to marry Imperial Prince Morinari (later became Emperor Juntoku), who held the title of Crown Prince, as his empress in March 1209.
承元3年（1209年）3月、姉の九条立子を皇太弟に当たる守成親王（のちの順徳天皇）の妃として娶わせる。