How Dannine built the fortune
Dannine Avara did not found a company. Her fortune traces back to her father, Dan Duncan, who grew a small Houston propane business into Enterprise Products Partners, now one of the biggest operators of pipelines and processing plants in the United States. After Duncan died in 2010, his ownership passed into trusts and family companies, and Avara became one of four children who benefit from them.
What makes the inheritance valuable is the nature of the asset. Enterprise is a toll collector for the energy industry. Producers, refiners and chemical makers pay it to move natural gas liquids, crude oil and other products through its network, to separate mixed liquids into ethane, propane and butane, and to load cargoes onto tankers bound for overseas buyers. Those fees are earned whether prices are high or low, and the partnership has a long record of raising its quarterly cash distribution. As the largest owner, the Duncan family collects a substantial share of that cash every year.
The estate's timing drew wide attention. Duncan died during 2010, the single year in which the federal estate tax was not in force, which meant his heirs received the business without the large tax bill that would otherwise have applied.
Companies and holdings
Avara's wealth is concentrated in the family's units of Enterprise Products Partners and in the private entities through which the Duncans own and govern the partnership. Those entities also control the general partner, which appoints the board and sets strategy. Her sister Randa Duncan Williams is the family member most visible in company leadership, while Avara and her other siblings have played roles in the family's governance arrangements described in public filings.
Enterprise's main assets include:
- an extensive network of natural gas liquids and crude oil pipelines
- the fractionation and storage complex at Mont Belvieu, Texas
- export docks on the Houston Ship Channel and elsewhere on the Gulf Coast
- petrochemical plants that produce propylene and other building blocks for plastics
Because the partnership is publicly traded, its results, distributions and major ownership changes are disclosed regularly, which is the main source of information about the family's position.
Ownership through a master limited partnership has practical consequences for the heirs. Unitholders receive regular cash distributions rather than ordinary dividends, and the family's control of the general partner means outside investors cannot easily replace the board. That structure has kept Enterprise firmly in Duncan hands for well over a decade after its founder's death, while leaving operational decisions to a team of long-serving professional managers in Houston.
Early life and career
Avara was raised in Houston as the company her father started was expanding from regional propane sales into pipelines and processing. Dan Duncan launched Enterprise in 1968 with a very small amount of money and spent the following decades buying assets, building plants and eventually taking the partnership public in 1998. His children grew up around that business, and the family's identity remains closely tied to it and to the city.
Avara has kept a low profile in the media. Details about her schooling and any career outside the family's interests are not well documented in public sources, and she does not typically appear in coverage of Enterprise's operations or deals. Her public footprint is mostly connected to civic and charitable life in Houston.
Her generation inherited not only shares but also a set of governance responsibilities that Dan Duncan designed before his death. Voting control over the family entities was placed with trustees drawn from the family and its advisers, an arrangement meant to keep the company intact rather than divided among individual heirs. That design explains why the four siblings are usually discussed together when the ownership of Enterprise comes up.
Philanthropy and public life
Philanthropy is a central part of the Duncan legacy. Dan Duncan gave very large sums to Baylor College of Medicine, whose comprehensive cancer centre bears his name, and to other Houston hospitals and universities. Members of the next generation have continued to support medical, educational and arts institutions in the city, often through family foundations rather than gifts in their own names.
Avara herself has been associated with Houston charitable organizations, though she rarely discusses her giving publicly and the scale of her personal donations is not widely reported. She has not sought a role in politics or public debate, and she remains one of the less visible members of a family that controls a major listed energy company.