Re: Twins born as mermaids then aged and mysteriously became vampires?

@Rolliepopeye , thanks for updating us!😇 🥳 I'm happy to help!  While it will not fix your current household, at least you can avoid it in the future (and if you ever really want Vampire babies , you also know how to make that more likely, as it will happen with the Dark Ley Line lot trait even if the parents aren't Vampires themselves! ) 😉

As for fixing your current household, if you don't want them to stay Vampires, you should be able to correct it with this cheat: traits.remove_trait trait_OccultVampire. 

Happy Simming! 🥳