After lltpq do you think even though Albert and Greta are accepting to Jack and Sally’s marriage, Jack would still make great efforts to prove to them how much he loves Sally and even ask them for their blessing?
Of course!! It is a pretty big revelation in there that Sally isn't originally from Halloween Town and comes from elsewhere. I'm sure she would tell Jack that he feels like her home and Dream Town isn't where she belongs. Despite that, though, I think he'd go the extra mile to prove to Albert and Greta that he's helping give Sally a better life, and that he'd do anything for her. (Since they're already married, he doesn't really need to seek their blessing or anything, but he hopes he lives up to their standards and *might* put on a bit of a show in hoping he can prove himself.)