A big change has been the dual-income family, which means banks cannot simply tell a worker to move.

"There are a lot of busy dual-income families who can't book something at night, when most travel agents are closed," he said.

What are the upsides to being a dual-income family?

In my research I kept coming across articles about the new baby boom, dual-income families and concerns about the environment.

Martha, in other words, helps dual-income families live off the same page.

In dual-income families, men are doing 45 percent of the chores, though that percentage does not necessarily increase once a child comes along.

Many dual-income families work out of economic necessity.

Caneel Bay needs revenue from dual-income families with kids to survive.

One reason, he said, is that dual-income families now make up the majority among married couples with children, according to the Census Bureau.

But the spread of dual-income families has wiped out the leading waiter.