You may want to consider doing a flotilla type cruise with probably 3 boats each with a skipper and possibly an additional crew do any additional support functions such as cooking.
How long of a charter are you looking at? Hope everyone is 100% compatible! That appears to be a lot of personalities to attempt to combine into one vacation let alone on one boat. One of the crew may need to be a mental health counselor and medic.
You may want to put out an advanced itinerary to "alert" others....... well so we can give you more room....
I prefer a sailboat to a motorboat, and it is my belief that boat sailing is a finer, more difficult, and sturdier art than running a motor.... Jack London