Inconspicuous billionaires: as the family clan operates a network of Dillard's department stores

The mysterious family which possesses a network of Dillard's department stores, is known that avoids journalists, refuses to carry out calls with investors and evades from questions concerning financial results. Against competitors they seem so inconspicuous and not ambitious that them sometimes call "Dallarda" (from English dull — "boring"). How they managed to earn a family state and who they are? .