You and I have similar personalities, which I've mentioned before. I think you're slightly more type A than me naturally, but I've been working a lot this past year or so on recognizing what I can and cannot control. I wanted to mention this here because.... Similar to the trip T recently had to the beach... there are a LOT of things you would plan differently if you were planning this trip. There are a lot of tips and tricks you know and experience you can draw from and you have a million ideas of how to make the best of this trip for T.
But you're not planning this trip. They are. They are ultimately going to go with their own choices. And they absolutely won't be the same ones you would make. And they absolutely won't take into consideration the life lessons you've learned from previous trips. But you cannot control this. And even if dad sits in the resort because he cannot walk any more, and even if they only eat fries for dinner because there isn't a sit down restaurant, and even if they end up waiting fifty minutes for buses to MK.... T is going to have SO MUCH FUN. The other kids will too. And that's really what your parents want to get out of this.
I feel like maybe this might be a good opportunity to say "hey, consider how much walking is involved with this resort" but then take a step back. Because at the end of the day, they're going to do what they want to do. And T will have fun regardless.
It's not easy, but this is what I've been working on for a while now and it does make life a lot better when you let go of the things you cannot control.