Afterwards, he continued to gain Katsutoyo's trust, and married Katsutoyo's adopted daughter (Satouji ANDO's biological daughter, and Katsutoyo's niece) with permission to use the family name YAMAGUCHI.
その後も一豊に重用され、一豊の養女（実は安東郷氏の娘で、山内一豊の姪にあたる）を妻に賜い、山内姓の使用を許された。