It seems like Phoebe had so much confidence in her idea, she didn’t even need her dad’s input. Bill spoke to the New York Times about his reaction when she told him about the business, and revealed that he initially felt trepidation at Phoebe going into e-commerce. He told her, “Wow, a lot of people have tried, and there’s some big guys in there.”

Bill, who is also the father of Jennifer and Rory, recently revealed his kids will inherit “less than 1 percent” of his $108 billion wealth when he dies.

Phoebe Gates, 22, has just launched Phia - an app that helps shoppers compare the prices of new and used items across thousands of e-commerce sites - with her former Stanford University roommate, Sophia Kianni,