Is there a way to keep your dynasty within your own faction, instead of giving daughters away and/or asking around if some random sovereign happens to have an unmarried daughter?

I mean, by the time you have children there are tons of hired adventurers, advisors, researchers and merchants, so I wouldn't have to spare my opponents because of their children. And before someone says 'but royalty should stay within royal bounds' -> 1) As Sovereign you marry some random guy/girl and make him/her your king/queen and 2) some of those random people are royals themselves.

So, is there a way? I would especially love to keep my dynasty alive while at the same time being able to have my daughters under my direct command.