I can't for the life of me find out where information on who's married to who is stored, either for save files or startpos. Does anybody know where I should be looking?

I made the mistake of adopting someone before marrying him to my daughter, so I want to edit the savefile. I figure I can figure it out myself if I can find where marital relations are stored within the startpos, so I'd appreciate any help with finding out either solution.