I am having a difficult time with the family tree, specifically princesses. I search to the ends of the Europe with spies and diplomats for a fully stacked (Ha!) princess. She has plenty of increase children traits. Then after marriage she drops the bomb and informs the general public that she is in fact barren. Her father is probably toasting to his council and laughing at my family. So after dispatching everyone involved to frozen or desert wastelands for the remainder of their lives, I am left wondering what went wrong this time. But i guess the main problem I am having is this happens with about every princess I snag, and seemingly no way to prevent this issue. Can anyone explain to me why this happens and what I can do minimize this problem? (even my princesses have this problem when i marry them to nobles within my own control.)
To Clarify: Full heart princess with increase children traits --> married--> Good to moderate wife is (blank) traits and decrease children traits. wat do?