Since I have been studying the cruise ship layout I noticed the Destiny has connecting rooms called "Family rooms" there are located logically by the childrens playroom. Spa Deck 10. If you look really close there are tiny little triangles on wall between some cabins here, they indicate connecting. (See the symbol legend)
Maybe you can find these symbols on other ship maps. I figure look near the childrens center for rooms a logical place to put family cabins.