Random father-daughter rivalry
In the new royalty pack, I made a royal family: mum, dad, son, daughter. They all get along, happy little family. Mum and dad are level 5, son is level 4 and daughter is level 3 in the nobility career.
All of a sudden, for no reason at all that I can think of, daddy dear declares his own lovely daughter as his rival! Now they both can't move up in their careers.
I don't want either of them to leave the career. For some reason, I cant get them to duel about it, and I don't understand the other options to solving their rivalry in this case. I'm also obviously not gonna get them to murder each other. I can't imagine anyone getting any better after that. (Also, mummy dear is pregnant of a third, have some compassion!)
Why is this rivalry thing so random? Shouldn't it have a reason? A cause?
Can this be improved? Or am I missing some obvious solution?