4 Kathrine and Cecilie Fredriksen
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Billionaire Father: John Fredriksen
Family Fortune: $7.7 billion
Position on 2010 Forbes Billionaire List: #88
Norwegian-born shipping magnate John Fredriksen has been called “a modern day Onassis.” The shipping tycoon has amassed an impressive fortune by building oil tankers and drilling equipment for maritime oil exploration. His 25-year old twin daughters are Scandinavian smoke shows who work in companies controlled by their billionaire dad.