Additionally, Shigemasa YAMAGUCHI, the grand master of the Negoro Group of musketeers and the lord of the Ushiku domain, was the first father-in-law of Masakazu's third son, Masatake.
また、根来鉄砲組師範で牛久藩主、山口重政は、正一の三男正武の最初の舅である。