I am besieged by the idea of the reincarnated first humans being Alastor's children but specifically they came from a other universe and all showed up via portal in Expired with some deerish features, and they're looking for help for their poor injured Mama (Alastor is dragged into frame looking crispy fried from fighting Vox)
Okay, well first off, I have to ask - would Expired!Lilith feel something odd, some sort of soul resonance, looking down at her reincarnated self? If she does, and she hears her being called 'Lily', she might well put the pieces together and realise this is an alternate version of her, and then the Expired verse might realise the other two are alternate Eve and Adam, and not just, say, their kids. In which case, since Alastor is unconscious, they are trying to figure out - are they reincarnated? (yes) is this an alternate universe where God made Alastor to be a mother of the first humans and they are from Eden - but they're wearing clothes?
Someone who isn't Lilith and doesn't feel the resonant - so, probably, Lucifer - thinks they might be the First Humans children with Alastor, which means little Lilian and Eva are Lilith and Eve's kids and Charlie! Come meet your half sister from another universe and HER half sister (and also, I suppose, Adam's son, I'm sure he's good if he's half Alastor).
Lots of confusion is what I'm saying. It would be fun!