Vlerin...Who and What are they?

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Vlad and Erin are known across the Dracula household to be the worst couple you can ever come across, as Erin was a slayer. Despite all these things and names that Vlad and Erin get called, Vlad forces everyone to treat Erin like they treat him.
Vlad and Erin treat each other and everyone equally, hoping that the same will happen to them, but it does not.