Department of Post-Mortem Communications
#2
30th Jan 2018 at 8:13 AM
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If you mean that they freak out like neurotic Sims then this seems to be unavoidable; even the vampires themselves freak out occasionally in the presence of other vampires or when others freaked out because of them.
I once did a quick and cursory search in the game files to look for any clues because of that but didn't find anything. I am still unsure therefore what triggers the freaking out. One theory that I have is that it is the "Hunted" moodlet and that other Sims know when there's a Sim on a lot with that moodlet. I still remember, though, that when LN was released that the problem was much worse, because back then Sims wouldn't simply freak out but would puke when they were near a vampire; they fixed that in a later patch.