The Draper family is the closest Silicon Valley has to a royal family. The progenitor, William Henry Draper Jr., created one of the first West Coast venture outfits in 1959, with the family’s web sprouting more than a dozen firms in the following decades, from Sutter Hill Ventures to Draper Associates. The dynasty even has its own reality show. Adam Draper has been carving out his own name as part of the family’s fourth generation. The great-grandson of William and son of the Bitcoin evangelist Tim Draper, ...