Norwegian Jewel, like all of the Norwegian fleet, is built with families in mind. It offers amenities like interconnecting cabins, children's menus in the main dining rooms, a kids-only pool with a waterslide (though we saw adults in there) and two free kids clubs.
The dress code is completely voluntary although many people find it fun to adhere to it which is as follows: Monday=white; Tues=Red & Black; Wed=elegant; Thurs=blue&white; Fri=black&fluorescent; Sat=colourful or flowers; Sun=jeans& 45(Club med tee shirt). BTW, this info is available with the Club Med app. Enjoy!