Sandy, have a brilliant time, and it will work out fine with your friends, just agree to all do as you wish, like phil says there are 3 of them, so they can sort themselves out.
Sue, you dont sound selfish, I would love to bring mum and dad to arillas, but they are both too disabled or think they are. Your dad sounds great, you could leave him to do his own thing and you do yours. Like BG says as well, cherish the memories it will bring. ARillas isnt going anywhere.
Sharon x