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Marc. If you want to stay with a smaller unsinkable I would look at the Center Console version (Montauk 150) yes you can sit 4 people safely especially if they are kids. A bow cushion will be handy changing those diapers of the 1 year old. I agree with most of what Clevelandbill says except I never have water coming in over the stern.
Bottom line to give JRP credit, the bigger the boat the safer overall. Look at a Montauk 170 which van come with two aft seats besides the RPS, cooler seat and bow cushion.
One thing with Supper Sports is you have to step over the thwart (seat) to get fore and aft which underway or floating could be dangerous especially for younger kids. Look up the meaning of thwart;prevent (someone) from accomplishing something.
The Boston Whalers are much better choice in your boating area than a bow rider would be (unless it is a >25' bow rider)
Bottom line look at both 15' and 17' Center Consoles depending on budget.