Milane Duncan Frantz
Based in Houston, Texas, her father’s pipeline business has nearly 49,000 miles of pipelines. The now 50-year-old inherited her stake in the company that her father co-founded (Enterprise Products Partners). When he passed away in 2010, her net worth rose to $6.3 billion.
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Milane was born in 1970 to Barbara Ann and Dan Duncan. The children, Dannine, Scott, Milane, and Randa all inherited a tax-free $10 billion share the estate. That was when the so-called “death tax” was temporarily repealed. Each of the children have an estimated net worth of around $6 billion. Her sister Randa is the most visible of the four Duncan heirs, as the chairwoman of Enterprise Products Partners LP. Last year, the company earned a revenue of $36.5 billion.