I have to agree. While for immersion purposes it would be awesome to give higher ranks more power to choose their prioritized units, for simplicity we will probably have to go all the way one direction or the other...

It's kind of like the House names, I've love to have Houses named after families, but it would be impossible to keep the DUcal lines to those families, so regions work well as a second option.

The House chain idea seems fine to me. From the looks of the recent posts having the branching House trees seems popular so I might as well give in.

I wanted oath breaking to be rare but it may be needed for organizational purposes early on as the Houses are worked out...