The second son of this house in the Forest of Chin was the mediator who failed to prevent the eruption of open hostilities between House Zhen and House Sung a couple of years pregame. His services are no longer required by the Warlord, but he can stand up to Zhu Cai Wen in a conversation.
Tsai Keep is the seat of House Tsai. House Mong is trying to establish itself on House Tsai's lands -- as of the scroll three end, House Tsai was preparing for combat against House Mong, to be resolved within a month.
Tsai Su-yin is the heir of this house. The Warlord of House Tsai seems displeased by the fact that she's a monk and very excited to believe that Xiao Fa on the Isle of Beauty knows her well.