Yeah what Leto said.
And it was like day 3 or something and there wasn't any vampires in town.
You can add a vampire to your household with 'testingcheatsenabled true' and than Shift-clicking on the vamp you want to add to your family. If you don't like to do that, than I will upload my vamp for you if you like. Pure vamp, so it wouldn't be any trouble for you to install. What do you want: male, or female?
@the others: I have tried breeding a Mumpire Imaginary Friend Ghost by using the old breed-in-house-hold-mummy-trick but although I do indeed get mummy-ghost childs it seems to completely overwrite the Imaginary Friend hidden trait and even worse: no sign of vampire DNA at all!

Hmm, perhaps I should keep on trying.