Sweetie had the Avril Lavigne/Evanescence 2000s Pop Goth phase. Wore lots of black. It was a thing.
Nevermind that black is still half of her wardrobe, it's considered cool now. Adult Sweetie is still in politics, still feels like she deserves better than she gets, likely still has ran/will run for office in a modern setting.
I feel like Vivienne and Sibylla would be Real House Wife types, but they wouldn't
like each other. Vivienne would have her own brand, while Sibylla would be a full on house maker and both would butt heads about it (and these tv shows totally x10 these things for the #viewers).
Vincent has a pronouns journal. Every time he learns about a new pronoun that someone identifies as that he hasn't heard of before, he writes it down and tries to read it back to himself. He doesn't always get the pronunciation right, but he keeps trying.
Modern!Vampire Vincent would likely have tried to be part of the political parties more actively, if not running himself if the law allowed.
Highly doubting vampire rights would be great in modern times.
Rosie's got some sad, so spoiler tags:
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Rosie stopped wearing dresses entirely in her early twenties when her mother had mentioned just how much prettier she looked in them a few too many times. Probably married in her thirties, after having a career. If not gradually going complete no-contact with her parents, she has at least kept them at a distance after hs, going to college on scholarships and loans. No, they don't get alone time with her kids.