I have seen alot of posts lately talking about Dynasties, but I have a specific set of concerns with respect to children and your family. Perhaps this may be a lack of knowledge on my part, but currently, there is no way for a child to get married without being married to a rival faction. With respect to male children, this is fine as the new wives are given to your faction an grandchildren eventual join too.This would be fine if every faction received an even distribution of male and female children.
However, consider the scenario where by you sovereign has all girls. In this scenario, your dynasty would be doomed to either have no grandchildren while these female champions fought for your faction, or only have grandchildren as members of other factions. If you married of your children, you would gain diplomatic bonuses, but your rival faction would also get access to the spellcasting grandchildren of your children making them far more powerful. I think it should be possible for your children to marry npcs just like the sovereign so that grandchildren can be produced by a single faction without having to intermarry.