Going against the grain for the ESH. Your Parents shouldn't be pushing you to include someone so severely disabled and then trying to throw you under the bus about it but YOU should not have used him as a pawn against your parents in retaliation to try to goad them into making that decision and putting it on them.

He's his own person. For his sake, I hope they truly know best. Travel to another country as someone that disabled could be an uncessesary risk to them, it's certainly important to weigh the options. Do you have any idea how accessible Jamaica is to someone with his condition, how well air travel might go, what safeguards are needed to have in place in case something goes wrong?

The way you talk about your brother is definitely ableist and I think both you and your parents have some issues to work out in regards to your relaitonship to him. Being uncommunative doesn't also mean he isn't at least some level of aware for what he's going through. The brain is incredibly remarkable and complex. I don't know exactly your situation but describing a living person as a body isn't right under any circumstances. He's Still a person.

It's understandable why your parents want him included and asked for it to be in town, just as it is your right to turn that down and have what you want. It's your wedding and your choice.