Originally Posted by EatYerGreens
On the subject of keeping track of which factions you've had marriages with, I'd be interested to learn whether the game really does track the genetics of it so, for example:-
You marry a daughter off to the Danes;
A few generations go by and the Danes suddenly have a glut of daughters;
You need to get your heir married and approach them.
This is basically some form of cousin-marriage.
Another few generations pass...
Do your male heirs come of age with "chinless" or other varieties of "less than eight great-grandparents" vices?
There are more complex permutations, such as you marry to the Danes, a later generation of Danes send a daughter to the Spanish and a later generation of Spanish sends a daughter to you, and so on - but all with the same potential consquences.