For sailing with kids or such go with the Hobie wave, A bigger alternative would be a Dart 18 if you can find one localy. both of these boats would not be overpowered for single handed conditions but will take multiple people. Most importantly, both those boats can be righted solo if you flip with your kids on. Personaly, I think the getaway weighs way to much to be considered as a single hander. Anyway, you will have alot of fun on a cat.

Good Luck,
Eric