Oasis is great for kids and active adults, but not an "elegant" experience. Our adult dtr found it a bit disappointing and shopping mall like! But our son in law liked the zip line and flo rider..
We are seniors and did not enjoy it very much.... too big, crowded in most places, tickets to reserve and lines to wait on. The Diamond cocktail hr was an exceprion..very well done! Daytime, we hid out aft in the adult only area.
Dining on Celeb is much better; even the mdr is better than specialty on Royal in our opinion. even with skme cutbacks Lots of family friendly activities on X..teen/ kids club, stem, parties etc Something for everyone.
What about something including new Eng, Bermuda and Charleston along US East Coast?
trip should focus on the desires and wishes of the parties being treated! maybe one nice dinner together at a Specialty restaurant..
if SIL wants extras she can book and pay for them sep.
just my thoughts!