The four children of pipeline mogul Dan Duncan - Randa Duncan Williams, Milane Frantz, Dannine Duncan Avara, and Scott Duncan - inherited a $10 billion estate from their father when he died in 2010. The net worth of each heir exceeds $5 billion.
Randa enjoys the highest profile among the four Duncan siblings. She is chairwoman of Houston-based Enterprise Products Partners, the pipeline giant founded by her father, and owns Austin-based Texas Monthly magazine.
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