I've just seen this in my game...and some other mods of M2:TW. I would really like it to be fixed tbh as I like to keep the blood-lines running in my families!
On a separate note:
I was recently reading a book about Richard the Lion Heart (

) and had somewhat of an idea - I know nothing about scripting and coding etc so tell me if it's impossible but...
When you steal a general from another faction, would it be possible for territory to come with them? Many M2:TW mods implement titles for their general so could the title be attached to the settlement in some way?
Example:
My princess marries a French general who has the title for Bordeaux; the lands of Bordeaux then belong to me?
It would add an interesting new use for princesses and enhance realism.