Sovereigns start single and marrying other Sovereigns.

I think in terms of the dyanasty sytem that Sovereigns should all start single, this way you the player can marry a particular Sovereign if your relationship is good enough, or as a last ditch effort for whatever faction/ or yourself to avoid complete destruction.

Currently all the Sovereigns start married and have children, while your Sovereign does not, and currently thats no fair and limits some interesting possibilities.