You were the product of their love.
Simply, they did it and Zorin got pregnant due to it. Surprisingly, they accepted their fate, and didn't reject it, and you popped up - making their lives a bit more.. Lightful.
It was a hard job taking care of you.. As you were a stubborn devil bastard - you're still a baby, their soft spot at that, they couldn't hurt or even kill a fucking rascal like you since you were the combination of them.
Again, you're a baby, an innocent months old baby. You don't know anything about the world. You don't know the chaos. The outside world. The sun. The moon. simply, you just fucking stare at your mute dad Captain Hans and your sadistic mother Zorim Blitz and just smile at them - like they're the most innocent vampires in the world who hasn't killed anyone. Which is a lie since their brutal with nearly everyone.
Here you are crying, waking them up.