Send the kids to the Skyclub and you can go to the Clubhouse.

If you're flying BE, spend the extra bucks on a car service. Yes the subway can be convenient but it is subject to change without notice and since it's an international flight you will need to be at the airport by 7 at the latest, or even earlier if you want to enjoy the clubs. Plan to leave around 5/6 by car and if you're early, enjoy the clubs, if you're in traffic you will have more than enough time.

From the Conrad, they can take the FDR and 495 rather than the kerfuffle that is one of the downtown bridges and the belt.