Okay, I've reread the whole thread now and I see that my previous question was answered there, so I apologize for asking that before the read-through!
It seems that it is okay for Sims to become vampires outside of the Vampire bloodline option. My bloodlines are Alien, Mansion, and Vampire Hunter. It is acceptable for Vampires to move in as helpers and it would be okay for spares or helpers to become Vampires in the Mansion and Alien households, correct? Can they also be cured later even though that resets their age?