In addition, he married off his daughter to the legitimate son of Ujiyasu HOJO, Ujimasa HOJO, entering into the Koso Alliance (an alliance between the Takeda clan in Kai Province and the Hojo clan in Sagami Province).
また娘を北条氏康の嫡男北条氏政に嫁がせ甲相同盟を結ぶ。