Years ago, by now, Caleb has long since lost track, he and Lilith were born to a pair of merchants in Spain. Many would say, to some extent, his life was notably easier. Lilith, being female, had to deal with certain expectations that weren't necessarily placed on the shoulders of an elder male sibling, but then, Caleb had his own expectations and weights to deal with.
While Lilith was learning to be charming and refined, Caleb was learning to take over the family business. The thing about Caleb is, he's never been terribly assertive. His father found this... disappointing. Even more disappointing was his notable interest in both genders, something his father tried to get out of him through most means one can think of--only religion seemed to work, and it was merely because Caleb stopped making it obvious.
Lilith always said he should be who he was, but being made to feel like everything he was somehow was wrong made him afraid to be. It's the one trait from his childhood he can't seem to shake. As usual, he fell in with the wrong types, became a vampire, and had not the faintest idea what to do about it. And as usual, it was Lilith that saved his behind. Rather, she tried. Lilith was eventually overpowered and turned, too, but she seemed more willing to accept it than Caleb has ever been. He lives with it, sure, but some view vampires as parasitic monstrosities, and most of the time, Caleb agrees with this view.
Lilith isn't a parasitic monstrosity. Everything else is wrong with Caleb, why not this, too?
In time, they came to live in Forgotten Hollow. Lilith was hoping to learn from older vampires, and become stronger, more able to control herself. Caleb has snapped a few times and fed without intending to, and primarily focused on taming the thirst, that he never lost it again. He killed a few times, on accident, and decided he never wanted to kill again, not if he didn't have to. He tries not to think about it.
Lilith was supportive, and still is, of his choice not to feed from humans ever again. She even fights with the Count on his behalf, though he does wish she wouldn't. When she decided to move to San Myshuno, Caleb went along with her, but he's not made for the big city. He's a small town and quiet sunrises type of guy, and he's losing sense of who he even is out here in the bustling streets and towers of steel and glass. He wants to go home, but the thing is, he's never known what 'home' is. For now, he works a catering job, little more than a waiter, and is hoping to enroll in a fine arts degree at the University of Britechester.
Maybe somewhere in it all, he'll figure out who the hell he is.