Following on from TCores' post, I feel there are not quite enough options for finding a spouse, or marrying off children.
First off, shouldn't children be able to marry Champions? Why can't I cement alliances between my Champions and my Kingdom with the hand of my son/daughter?
Secondly, there is currently only 1 means to marry your sovereign - recruiting a champion of the opposite sex. Without getting into any of the issues around Elemental being a heterosexual idyl, why can't sovereign's marry the children of other sovereigns? Why can't sovereign's marry the heads of minor factions? Why can't sovereign's marry other sovereigns?
I guess the above are listed in roder of perceived difficulty/complication for beta4 to handle, but even a Sovereign-sovereign marriage could perhaps to be possible, as a very high level diplomatic option...