We have had two family reunions at WDW. the first one in April of 1990. Twenty-six of us (immediate family). We all stayed at the Grosvnor. Flew our sister in from Australia as a surprise. It went very well. Children aged from 4 to 18. Adults up to age 69. The Grosvenor arranged for a private Character breakfast for our Australian guest. It was great!
Our second reunion was in 1997. We stayed at OKW. A Grand Villa and two - two bedroom units (24 of us). Again, it was a wonderful time. We are planning to do it again possibly next year. We have a great family and even though the "kids" have grown up, they still love to go to WDW.
It takes a little bit of planning but it is well worth it. We loved getting in line and telling the CM's that there were 26 persons waiting to board!
Good luck!