Two billionaire daughters reach the U.S. Open semifinals. Here’s where their money comes from.

Two billionaire daughters reach the U.S. Open semifinals. Here’s where their money comes from.  CBS NewsBillionaire Daughters Pegula And Navarro Are Into U.S. Open Semifinals: ‘No, I Don’t Have A Butler’  ForbesUS Open live updates: Women’s semifinals feature Emma Navarro vs. Aryna Sabalenka and Jessica Pegula vs…