Donna, I have a very big family and we have travelled together a number of times. We range in age from 60ish to 11, with every age covered in between.
Rule #1: You Gotta Have a Plan. If you try to manage ad hoc, no one except the most demanding of the group will enjoy the trip. This is why cruising in my opinion is uniquely and totally well- suited to multi generational travel. We went on Disney cruiselines with 35 family members and everyone had a blast because each could do what suited them during the day and we all had dinner together each night to swap stories about what we had done.
Rule #2: Someone has to be in charge of creating Rule #1!
We have found it to be a wonderful way to stay together and in touch even though we live on both coasts.
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Helen