In the same year, he received Ujimasa HOJO's sister as his second wife (Fujin TOYAMA died after the birth of Nobukatsu) to strengthen the Koso Alliance (an alliance between the Takeda clan in the Kai Province and the Hojo clan in Sagami Province).
また同年、甲相同盟を強化するため、北条氏政の妹を継室（遠山夫人は信勝出産後死去）として迎えた。