Sea dog,
If you can make it to the boat show, stop in at Winnisquam Marines booth and speak to Ryan Crawford about your needs. They sell both pontoons and fiberglass and he will set you up with the proper boat and treat you right.
My personal feeling would be a tritoon in the 24' range with big horsepower. I think this setup will do exactly what you ask just nicely and be a very a safe platform for your family.
Good luck with whatever you decide!
Dan
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It's Always Sunny On Welch Island!! 
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