We did an eleven member multi-generational trip with age ranges infant to 92 yrs of age. Would love to reminisce and share what worked for us.
Same hotel: We stayed at the same hotel to facilitate ease of linking up and getting to and from parks.
Motorscooter: I got a motorscooter delivered to the hotel for my Grandma and we drove our SUV and my sister rented a minivan to go to and from the hotel and parks. We used a small trailer on the back of our SUV for the
scooter. Front row parking with the handicap pass. You may want to think about a scooter for your group member that is recovering from cancer. Scooter was ordered from Randys Mobility and they dropped it off and picked it back up at the end of our trip. We got one with a sun shade which was wonderful. You should not have any problems getting on and off Disney transportation system with one either.
GAC card: we did not get one b/c it was pretty obvious why Grandma, though spry, could not stand in the lines and needed to go through the handicap entrances, but you might want to think about it for your situation. The entire family was able to accompany her through her entrance. Sometimes they would have us wait to get on rides until our fair turn (with benches available to sit on/or she could stay on her scooter until nearly the last moment), sometimes we even walked right on.
Plan your itinerary and let the rest of the group know it: We planned our itinerary, with plenty of emails flying back and forth about which parks which days and meals we wanted to do together. I was the researcher/expert so I chose the parks for each day that I thought would be least crowded and then we planned meals around those. I then put together our plan based on what had been agreed/discussed and let everyone else know they were welcome to move around with us on our schedule or do their own thing. My Mom, StepDad and Grandmother elected to stay with us the entire time and we had a wonderful time. My sister and her DH elected to do a couple of things differently as far as meals and parks and it was good to know that ahead of time.
Expectation Management: I made sure my kids (8 and 11 at the time) and especially DH
understood that this would not be commando go go go til you drop, that we would spend some time during the heat of the day at the resort and that we had plenty of time to do everything we wanted and we would take time to sit on a bench and smell the roses. This was my Grandmother's first and probably only trip to Disney so we wanted to focus on making it magical for her. Everyone agreed that this would be our focus and it made our third trip to the world extra magical for us because of it! Since she still rides all the coasters she was easy to accommodate. The only ride I did not let her ride (and I had to tell her it was closed for maintenance. b/c telling her no was not going to work
) was the RockNRoller Coaster. I just did not think that one was a good idea. Could not hide ToT from her (all those screaming people) and she loved it. My Mom did not
Split up: We did split up at parks some when my sister wanted to do younger rides with her little people and we wanted to do bigger rides. My Mom and Grandma rode all the bigger rides
(ToT, Splash, SpaceMtn etc). We would meet back somewhere at the park or resort or sometimes not until the evening meal. A lot of that was prearranged but not all of it. We did take their kids to Fantasmic and they took our kids out and about to the big rides at DS. They enjoyed that and we enjoyed seeing our 4 year old nephew ooh and ahh. The infant slept until the dragon came out and then he was big eyed and watched it too. Still love that memory of them both watching with their little mouths in O's and their eyes bright and big!
Baby Swap: this was a big bonus as someone would sit out with the baby and then that someone would ride with all three kids immediately after. My kids and their oldest (a tall 'almost' 5 yr old) got to ride almost all the rides twice in a row!
Meal Plan: We were all on the meal plan so we did not have figure out how to split up the check at the end of TS meals, or collect money for counterservice meals so that only a couple of us stood in line. Just collect up the cards and viola the meal is paid for. We prearranged payment of TS tips amongst ourselves, so there was no discussion/issue with that ever.
I tend to be a bit wordy, but hope something in there helps you. Most of all tell yourself every day before you go how wonderful it is that you get to do this as multi-generational! Attitude is half the battle sometimes
Hope you do have a truly wonderful time of bonding and no tempers flare