In my Immortal Dynasty, the founder married and had a child. However, when I loaded the game, according to the family tree the founder was now dating another member of the household. Their pictures were connected by the pink line usually indicating boyfriend-girlfriend relationship. However, in the relationship panel they still showed up as acquaintances and there was no interaction to Break Up or Ask to Just Be Friends. When I had the founder have romantic interactions with her "husband," all the other household members got the "Witnessed Betrayal" moodlet and a severe relationship hit.
Does anyone know how to fix this?