Tim, Welcome to TheBeachcats.com!
You didn't mention if you have previous beachcat experience? Also how old are the grandkids?
The Prindle 19 is indeed an extremely high performance beast. Would do the job in very light air but could quickly get hairy. It's a BIG boat and handling 400+ pounds alone can be a challenge depending on if you are launching from a ramp or beach.
If you are really experienced, and sail in light air only it might be ok, tell us more.
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Damon Linkous
1992 Hobie 18
Memphis, TN
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