Ah, interesting. I believe I've heard something similar, though with demons, and not vampires. was Alucard... more a Demon? That's simply fascinating. It would be an interesting aspect to consider. If he was a demon instead, he could theoretically return.
Hellsing? I've known of the Hellsing family for many generations, though I've never met one. You're quite infamous amongst the vampire community as the most efficient, frightening hunters in all of existence. It's an honor to meet you, Integral. My library is located in my home, at [address] in London. I'll be here, if you need anything. I'll have Freedom make some tea, and see if my descendant has any cookies or biscuits to offer, as he often comes by to make sure our guests are well looked after. I'm rather horrible at cooking, myself, and Jack's worse.