[RL] Sims changes Dynasties/Constant message after loading

This is happening to me too. It doesn't matter how many times I delete sims from a dynasty, next time I check the family they're right there again! 

Thanks to neighbourhood stories a lot of the established dynasties have had random secret babies with NPCs, so now my dynasties are clogged up with those random babies. I wouldn't mind if I could delete them, but they won't stay deleted!!

The game seems to be automatically re-adding any sims related to / descended from dynasty members, even after they've been manually removed.