I just did this a few weeks ago. My resort reservation starts the 18th, I have AP and DS has a MYW ticket. My friend and her family's reservation starts the 21st, they all have AP. Her family is all link as friends on
MDE and set that we can make plans for each other. I was easily able to book all their FP with ours when my 60 day window opened up even though her window opened a few days later. Just make sure y'all are linked up properly on MDE and
it shouldn't be a problem if everyone is staying onsite