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1. The Rothschild Family

Dating their financial success back to 18th century Germany, The Rothschilds have remained a mysterious force in the biz for years thanks to their low-key public profiles and private, international transactions. Back in 2015, an heiress we all know by now, Nicky Hilton, married James Rothschild - literally combining the two powerhouses in union. We're sure this family won't be facing any money troubles soon - the Rothschilds' combined worth reaches up to $2 trillion.

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