If it is cramped and awkward sail with 3 people on board (which it will be with Snipe), your kids may not like it and will get a wrong impression. With so many cheap boats out there it would be silly not to get something all 3 of you could enjoy. And Snipe ain't it.
Where are you? Lake? River? Ocean? Different regions have fleets of different boats because of local conditions that favor one type or another. Are you planning to race or picnic-sail? Many good suggestions above, but ymmv because of where you are.