Well, let's hope that this is improved at a later date. Marriages in the Middle Ages were highly political and economic in nature. She'd have a dowry which would include land, money etc. Marriages were also used to cement alliances. Of course, the prospective wife's family would have expectations of climbing the social ladder through their connections to you and you will have obligations- expect to have your in-laws coming around and asking for favors of all kinds. Double-edged sword, that. Done right, this would be a brilliant addition to the game system.