As for the connection between the Wakasa Takeda clan and the Hosokawa clan, Yusai's older sister married Nobutaka TAKEDA (a military commander, called Miyagawa Dono, the castellan of Wakasa Shibo Yama), who was the younger brother of Nobutoyo TAKEDA.
若狭武田氏と細川氏の関係であるが、幽斎の姉は武田信豊の弟、武田信高(戦国武将)（宮川殿、若狭新保山城主）に嫁していた。