Married other soveirgns is likely out for diplomatic balance reasons.  If two factions basically became one with a clever marriage,  that sounds like a pretty easy match (double champions, cities armies etc).

Marrying another soveigns children could be ok, particularly if you have the required diplomacy technology for permanant alliances.

Dowry could be a good tool to balance some of the more interesting marriage options.  Rival or minor factions, which may give a major boon to your faction either through addition of a city or resource or through a solid alliance, could require a suitable marriage gift of gildar to agree to the proposal.

i expect marriage to be expanded in an Xpack as well as Diplomacy but i would like it to have more depth because in most fantasy worlds that are not Dark you hear that the King or Queen marries out of love rather then just the need unless impending doom...

i think stardock won't allow same sex marriage because of it being Political and also they might not want the game to be rated higher then it should be.

I don't expect to see much additional complexity in the RTM version, but I'd at least like sovereigns to be able to remarry if/when they outlive their spouses. Being a permanent widow/widower before you have a decent batch of kids is a bummer.

On the idea of more dynasty options. I love the idea and it really follows the medieval theme.

I also like the idea of being able to mary other sovereigns or have your sovereign marry their children, but this should not lead to a combined kingdom. Rather it would be a diplomatic option like an alliance (Which is realistic given historical use of marriages).

I personally think we should take this a step further and allow your sovereign and your champions to grow old and die eventually. As it currently is, your kids end up being 20 while you're still 26 which makes little sense. Growing old and dying is a natural part of reality and it can be part of the gameplay as well. If your sovereign dies and has no children, then you can one of his champions to succeed him or perhaps a bastard child is spawned to take his place. If he has children, then he is succeeded normally.

I don't believe that you can re-marry after their death... kinda a poor implementation and suggestion on the devs there, lol.

Re-marriage (and harems...) has been asked since day 1 of whenever dinasty was included in the Beta. Unlike the game mechanic about the Sovereign death ending the game, this one hasn't been changed a bit. I suppose that eventually Stardock may change it but once they start working on developing further the dinasty system (that currently is "capped" from its original purpose, if my memory serves right).