For more than 75 years the Hunt family has meant big money in Big D, and often big news, too. Eccentric oilman H.L. Hunt built the world's largest fortune and secretly supported three families at the same time. His children built Reunion Tower and the Mansion on Turtle Creek, coined the term "Super Bowl," infamously failed to corner the silver market, and recently signed an eyebrow-raising oil deal in Iraq. But the branch of his family led by his eldest daughter, Margaret Hunt Hill, lived quietly. She flew coach, attended charity galas and became the glue that held the family...