@ Seabody: If you've saved and shared them as individual Sims in CAS, you will have 3 separate .sims3pack files, one for each Sim. It's best to create a separate thread under Swap Shop>Sims for each. But if you saved and shared them as a household, in CAS or in game, then they will all be included in one .sims3pack file and you would upload them in a single thread as a household/family under Swap Shop>Sims.
As for the Vampirism, I don't know, give it a try and see what happens.