If you can sail on the new ships like Statendam or Rotterdam those ships would have the nicer musical venues.
But given you kids age, Think about the new Disney Wish with interesting venues and their great island called Castaway Cay. Othewise, consider sailing out of Port Canaveral on the new Wonder of the Seas. Lot of places to eat and the 82 year old in your family would enjoy the Boardwalk and Central Park area.