I know how! One word. Continuity. Like Holtzmann being the daughter of Egon, Abby being the daughter of Ray, and so on.
They don't need to be the daughters of any of them. So many fans keep pushing that idea, it sounds so cliched and forced.
It's such a non event as a narrative touch. (as an aside I always equally disliked the idea of having Oscar be a GB in a hypothetical GB3.) Ghostbusters works because it's three slouchy science guys (or ladies in the new) who turn out to be the smartest and best in the room (along with their late arrival colleague in both cases) entirely
because of their skills, tools and drive. You make it a family business and it starts to become a weird birthright thing, rather than there being much for the characters to prove*. There'd be no reason for us to love any of the characters other than, "Oh, y'know, they're related to the originals!". It would hobble them from the off because they would be so explicitly tied to the originals. Ghostbusters should be a dysfunctional family of colleagues, not an actual sci-fi Waltons.
*Yes, I know there would be a "Will they live up to their Fathers?" crisis of identity thing going on, but isn't that a little dullsville and hokey for Ghostbusters? I guess
if they were fighting Gozer's kid and they hammed up the parallels it could
work as a rounded narrative, but yeesh! That's a card I never want to see the movies play!
I don't care for the UK tonight...
- Snake and Crocodile webcomic. They’re occasional Ghostbusters!