A generation of people who give care to their children and their parents at the same time.
A generation of people who are of an age to care for their elderly parents while also raising or supporting their own children.
The generation of people who are the children of baby boomers, whose lifestyle is governed by the fact that they must simultaneously care for the needs of their children and their own elderly parents.
Origin of sandwich-generation
So called because they are "sandwiched" between the preceding and succeeding generations.