This will never work.
All the NPC Lords got children too.
There are what, hundrets? of them.
The game would have to calculate hundrets of NPCs, their lifes, marriages, pregnancy, their offspring, after 1-2 generations the offspring from the offspring...
this will always be a cluster****.
Its not CK2 where you only got some numbers more on a character sheet if someone gets 3-4 children.
That are all characters that needs to get fitting skills (and perks -_-) and whatnot. They will walk and act in the world.
To do this properly you would have to program a whole simulation system that would be a kind of a game for itself alone.
This is simply an additional complication in a game that is already hell to balance.