Nearly 10 million adult children are caring for aging parents today, according to a study by the MetLife Mature Market Institute. But, while aging is inevitable, planning for the costs associated with dependency in the latter phase of life doesn't come easily to most Americans.

To cope with the hard times, millions of families have pulled together — stacking two, three, even four generations on top of one another. An NPR series explores the lives of three multigenerational households struggling with issues of money, duty and love.

Meet the families in Morning Edition's series about three multigenerational households struggling with issues of money, duty and love.