Set realistic expectations - especially regarding crowds, early mornings, cost, and together time.
If someone thinks that 22 people are going to roam the parks together for a week, they need to be clued in (gently) to the logistical problems in such a move. We do it in writing ("because of the variety in ages and interests, plus we all know how much Dad likes to sleep in, it isn't practical for us all to spend every minute together. We will be collecting ideas for a few group activities.")
Cost: "We will pick up the cost of the rooms. You will need to pick up food, transportation, park tickets, etc. Attached are sample costs for this year." Put together a spreadsheet of sort of minimum costs (lots of counter service, eat in room, non-hoppers, magical express), recommended costs, and a budget buster cost (signature meals, special events).
Crowds and Mornings: "We are going during one of Disney's busiest times. Expect lines to get long by 11:00. If you want to see a lot of WDW on this trip, you'll probably want to plan on getting up early during this vacation and you'll probably want to do at least a little research on how to use Disney's Fastpass system, what rides are popular and which ones you can walk into even when its busy...."
If someone thinks that 22 people are going to roam the parks together for a week, they need to be clued in (gently) to the logistical problems in such a move. We do it in writing ("because of the variety in ages and interests, plus we all know how much Dad likes to sleep in, it isn't practical for us all to spend every minute together. We will be collecting ideas for a few group activities.")
Cost: "We will pick up the cost of the rooms. You will need to pick up food, transportation, park tickets, etc. Attached are sample costs for this year." Put together a spreadsheet of sort of minimum costs (lots of counter service, eat in room, non-hoppers, magical express), recommended costs, and a budget buster cost (signature meals, special events).
Crowds and Mornings: "We are going during one of Disney's busiest times. Expect lines to get long by 11:00. If you want to see a lot of WDW on this trip, you'll probably want to plan on getting up early during this vacation and you'll probably want to do at least a little research on how to use Disney's Fastpass system, what rides are popular and which ones you can walk into even when its busy...."