The Duncan family amassed a net worth of $22 billion in just two generations.
After a tough upbringing in rural Texas, Randa Duncan takes over the giant oil company her father built from the ground up.
When oil magnate Duncan died in 2010, he inherited a $10 billion fortune to his four children, Randa, Milan, Danin, and Scott.
Since then, the family's combined net worth has more than doubled to $22 billion, thanks to a rise in the company's stock price and personal investments.
Landa is the only successor still actively involved in the company, and she is non-executive chairman.
Meanwhile, all of her siblings invested their inheritance.
Read more about family fortune
humble beginnings
Born in 1933, Dan grew up poor in Center, Texas, and was raised by his grandmother after his mother died when he was seven years old.
Dan worked in oil all his life, starting at the bottom of the barrel.
After graduating from high school, he joined his father and worked as a pipeliner and oil field roughneck.
Dan then served in the Korean War and was stationed in Germany in the radio communications field.
After leaving the military, Dan studied business, finance, and accounting on the GI Bill while working for the U.S. Postal Service.
He joined Wanda Pipeline in 1957, where he gained 11 years of experience.
He founded Enterprise Products Co. in 1968 with $10,000 and two propane trucks.
The company has grown steadily, adding new pipelines almost every year.
We listed our enterprise products in 1998.
To date, the company has 51,000 miles of pipeline and 177 million barrels of liquid natural gas.
daddy's money
When Dan passed away in 2010, inheritance tax laws were temporarily repealed. So Dan's four children no longer pay taxes on their multibillion-dollar inheritance.
Landa, Milano, Danin and Scott all own an 8% stake in Enterprise Products.
Landa is the only person involved in the family business and serves as non-executive chairman.
Meanwhile, all of her siblings, including Scott, are investors, and Scott's personal net worth is estimated at about $6.2 billion, according to Forbes magazine.
At 40 years old, he will be one of America's youngest billionaires.
Meanwhile, the Duncan family's combined net worth makes them the 11th richest family in America, according to Business Insider.
But the Duncan children weren't the only ones who received large sums of money after their father's death.
Another brother poured his inheritance into investments, amassing a combined net worth of $15 billion.
Meanwhile, a tech billionaire is leaving only a “small portion” of his wealth to his children.
