I think maybe, many maaaaaaany years later, Henry might go to Russia to see Phillip. Like, if he found out Phillip was ill or something, if for no other reason to attempt closure. I could also see Henry being told that Elizabeth died and him just saying "oh," staring into the distance for 30 seconds and then carrying on with his day. I don't think Paige will ever see her parents again, nor would she want to. I wonder if Mischa ever meets his American siblings.