In one save, I have a vampire in the criminal career. He's gotten all the way to the top and has a lovely human wife and three kids. My plan is for the son to shun his father's criminal ways and become a cop instead, using the sunlight resistance potion to keep from burning up in the sun during investigations. There will be drama, as father and son butt heads about morality and what it means to be a vampire, and all that.
Usually, though, I have my vampires just kind of be supernatural bums, making a living with side jobs and having random adventures. One of my guys is a sort of freelance archeologist with a mage for a sidekick. Maybe you can have one of the kids join up with a group of other occult misfits and spend a chunk of their young adult lives exploring ruins, investigating Moonwood Mill's history, getting into all kinds of scrapes before they settle down, get a real job, and start a family of their own?