Adding Events maybe a good Idea perhaps like a event like "A member of the house has broken away or has had a illegitimate heir" or perhaps adding Royal Kingdoms and if a house becomes to big they have a chance to become the royal house which gives them more options for ex more people will come faster to marry into the house also this would make a year system kind of needed for the events like if you become royalty before the founding of the New World when it is found you have a choice of naming one of making a new title for that land and finally please update the game more often also all that I put was for endless =D
EDIT= maybe if royalty is added family members can revolt to take control but this will need a follower system which is a lot to ask