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<i>Image by <a href="http://www.flickr.com/photos/rosieobeirne/4090198486/">Rosie O'Beirne</a>/<a href="http://creativecommons.org/licenses/by-nc-nd/2.0/deed.en" target="_blank">Creative Commons</a> via flickr</i>

It's an unpaid, taxing and often thankless job. And it's being performed in nearly one-third of American households: Someone is giving round-the-clock care for an elderly parent or a chronically ill spouse. Author Gail Sheehy has been there and on Friday, she joins Jennifer Napier-Pearce to talk about the challenges, fears and rewards of caregiving.

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