"Van Helsing? As in the guy who killed Dracula in the book?" Sam asked in reply, raising an eyebrow before putting Bobby on speaker. "Bobby, you're talking about a character in a book who doesn't exist. Stoker probably didn't know vampires actually existed let alone hunters." He pointed out. 

Could there be a chance that they were part of that family though? The way the man knew what they were, and the girl's fear...it was impossible.