A growing number of seniors are finding themselves the sole caregivers for their grandchildren. Some U.S. cities are stepping up to help these 'grandfamilies.' CBC's Lyndsay Duncombe reports. »»» Subscribe to The National to watch more videos here: www.youtube.com/user/CBCTheNational?sub_confirmation=1 Voice Your Opinion & Connect With Us Online: The National Updates on Facebook: www.facebook.com/thenational The National Updates on Twitter: twitter.com/CBCTheNational »»» »»» »»» »»» »»» The National is CBC Television's flagship news program. Airing six days a week, the show delivers news, feature documentaries and analysis from some of Canada's leading journalists.