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6World Food Program's 2011 George McGovern Leadership Award recipients Bill Gates, left, and Howard Buffett, pose with Secretary of State Hillary Rodham Clinton, at the conclusion of a ceremony honoring Gates and Buffet at the State Department in Washington Monday Oct. 24, 2011. (AP Photo/Manuel Balce Ceneta)

Heirs and heiresses of America's wealthiest people

America is home to the most billionaires in the world — 442

at last count. We decided to take a look at some of the richest

American families and turn the spotlight from the billionaires

themselves to the heirs and heiresses who are expected to live up to

their family fortune.