In Kansas City, McDonald's is now testing a family-sized meal in a box. It has two Quarter Pounders with Cheese, 20 McNuggets, and two medium fries. It's selling for $14.99, which is a few bucks cheaper than all of that stuff individually.
I'm not sure what kind of modern family you can serve with only two burgers, 20 McNuggets, and two medium fries . . . maybe a two-person family and a small child? But if this goes well in Kansas City, you could definitely see it go nationwide.
McDonald's does sell family meals in other countries. In Australia, they sell the Family Dinner Box, which is two Big Macs, two cheeseburgers, McNuggets, four small fries, and four drinks.