In my save as a Vlandian vassal where Vlandia has conquered most of the map by now, mostly the one with the majority vote got the castle (sometimes Derthert took it for himself but that rarely happened).
That having been said, it was very peculiar. I joined as vassal, they took Quzai but gave it to someone else, then they immediately gave me two castles near Quzai but no city, I had to bide my time and wait my turn to gain enough influence to surely get a city, but by then two new clans had joined and suddenly every new castle that was taken two of the three clans vying for ownership were those two clans. Before long they had 10 properties among them, among which Marunath and Seonon!, and they hadn't even had enough influence to vote on themselvesl!
While nobody ever mentioned me.
This was frustrating, especially since I partook in every battle with a sizable force and had the most kills in all of them. However, I was able to roleplay this frustration into my plotting to overthrow King Derthert. I'm gaining relations with all the other houses so when I leave the kingdom without giving up my city, I can have the surrounding barons pick my side. *evil grin*