Oracene Price (center, with Serena and Venus) is the mother and coach of both Williams sisters. A less well-known figure to the public than their father, Richard, she has been a critical presence and motivator in their lives and careers nonetheless. "If my daughters said they couldn't do anything, I'd say, 'Yes, you can. You can do anything you want. Nothing is unattainable,'" she told Sports Illustrated in 1999.