Whilst she had been looking at developing them with the Song of Ice and Fire RPG, she mentioned using my rules to play the actual game.
I think there’s plenty of scope in there to adapt the rules for a game involving noble houses (or any organisation- a guild, the town guard, monastic orders, superhero team, government agency, and so on).
Each house could have it’s own traits, skills and possessions that characterize it, and the characters could substitute these for their own on an important dice roll (perhaps by spending a spin point).
I think that the characters would have to reflect the traits of their house in order to substitute them like that though – they’d have to each have one of the traits or skills listed, though not necessarily the same ones.
Alternatively, the houses could be formed and fight against each other, or work in concert, like a wargame. But I’ll have to explore that option a bit further.