Black Beauty

There's no such thing as overpreparing for love.

So...what kind of vampires. Classical ones, DL ones ?

Anyways, none of them would be torn about drinking human blood. In the DL verse, Charles might able to try and gain consenting donors. As humans, they already dissect non-consenying people they killed. Now, neither Jean-Baptiste nor Charles-Henri would be outright sadists, although for adult Charles that would be questionable. Marie-Josèphe would enjoy the chase and the kill for sure. But she'd be less willing to make a bloody mess.

Now, coping with vampire hunters...Jean-Baptiste would have an okay time coping with that psychologically, but he would have to contend himself to be on the run should he become a classical vampire. In the DL verse, he would perhaps be able to make a good living in the Vampire world. Also, passing for human would be something he is not good at. However, he would be good at making silent kills. He is very dexterous as a human and would make short work of any human vampire hunter.

Charles...Would have the toughest time coping with vampire hunters psychologically, but they won't really pose that big of a threat to his physical safety. Besides, he'd be rather good at passing for s human, ensnaring people in his trap.