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US President Barack Obama gestures to a wayward child to join the group of other children also dressed in Christmas elves costumes for a photo at a Christmas In Washington celebration at the Building Museum in Washington, DC, USA, 12 December 2010. Obama's daughters Malia and Sasha are at (L). ISP Pool Photo by Mike Theiler via EPA

The Obama girls grow up

As their dad Barack Obama accepts the nomination to run for his second term as president, Yahoo looks back at how much Sasha and Malia have grown up over the last four years.