How we handled Rogarvia in our game:
We expanded the houses a bit. The seven houses of Brevoy are all duchies, with the named families being the dukes over several smaller baronies contained within each Duchy's border. Normally the barons keep peace among their lords and the dukes keep peace among the barons within their duchy.

In order to give my PCs more influence in Brevoy politics and have their actions weigh heavy in Brevoy, I had a strong, canny, peaceful Rogarvian baron sponsor the party's efforts in the Stolen Lands. He is the young ruler that is getting married in Wedding Knight (GoT module) which I ran as a zero level adventure for the PCs when they were 14yrs old. They grew up serving the young baron and were rewarded and well-regarded by him, so when he usurped by his weak brother (who was controlled by an evil priest), the party became part of the Game of Thrones in Brevoy.

Why the missing Rogarvia family is so important

The regent needs at least 5 votes among the dukes to become king. He has Lodovka, Surtova (his uncle) and Lebeda wants to intermarry their daughter or son. That leaves two votes. Garess always votes last and basically "sells" their vote to the highest bidder to gain the most from each decision. That leaves one vote the regent needs to gain the throne: the duke of Rogarvia.

Unfortunately, there is no duke (due to the family disappearance). So currently the barons in this duchy are all competing to gain enough support among their fellow barons to claim the title. At the beginning of the campaign, things were balanced in favor of the PCs sponsor in line to become the next Duke of Rogarvia. He had secret, tentative agreements in place to support Medyvyed, Orlovsky, and a swordlord contigent vs Surtova, effectively blocking the regent from ever becoming king. When he is usurped, Surtova's pawn is next in line to become Duke.

This effectively makes the PCs directly able to affect who is king of Brevoy and makes every contest with other barons extremely influential to overall politics. So far in our game, the PCs have reinstated their sponsor, fought off attacks on their lands and their sponsor's lands by the "bad" future duke, and have military and trade alliances with several other barons in Rogarvia. They are campaigning to have him become the next duke since the PC queen is a swordlord and the general is a bastard son of Duke Medvyed.

Needless to say, our game is constantly busy between things happening "at home" in the Stolen Lands and major happenings in Brevoy that affect their newly created kingdom.

This is just one example of ways you can handle the power vacuum left by the missing royal family. Whatever you decide to do, I recommend that their absence be a major disruptive factor, as others in Brevoy attempt to fill in the void left by their departure.

les grands esprits se rencontrent

partir sur cet axe là est, en effet, très intéressant et je ne suis pas loin de partir sur cette idée là.
Mais comme je n'ai pas lu Kingmaker dans son ensemble, je ne connais pas les implications (s'il y en a) de chacune des 6 familles dans cette campagne. Mais je suppose que s'il publie ce post, c'est qu'il n'y en a pas en ce qui concerne la famille Rogarvia.

Je jubile déjà à ce que ça pourrait donner