That is only half our issue. Ryne attracted a player that is not that interested in the original experiment and expands constantly his families little empire. Hopefully the ill feelings towards the characters will boil over into real conflict eventually, though we may have left it too long, I think he now controls more land then the rest of Ryne combined.
The Duchy of Dairy? I'm familiar. I have a character in Ryne. And it's a few more regions than half that Dairy controls. Creena could just declare that no family shall hold more than X estates, and deal with the consequences.
Last I checked, didn't Ryne have some connections in Elysium though? Of course, there's a couple rogues running down around the southern border of Ryne (or somewhere past that) that, if someone could contact them, could be
convicned or bribed into some selective targetting.
That's of course assuming that the Dukedom of Dairy doesn't read the forums and take this as his opportunity to go bug out.