I am still relatively new to CK2 but I have never encountered this before. I was playing as House Frey in the Bleeding Years time period. I had two daughters. One was betrothed to the King in the North and the other to the King of the Vale. Well when it came time for them to be married they somehow wound up being married to sons of my vassal. Now I am both mad and confused as hell as. Anybody ever have this problem or know how to fix it? Thanks!