Sammy Dweck’s grandfather is his best friend—and most influential mentor. “PopPop is 96, and we speak daily.” The longtime life insurance salesman taught Dweck at the age of three how to look someone in the eyes when shaking hands. He taught his grandson to speak slowly and clearly to make people feel comfortable with you. Sure, Dweck’s on Facebook and Instagram, but he never hesitates to pick up the phone and call his clients. By 10, Dweck was envisioning his real estate career. He once walked around a friend’s neighborhood with a clipboard and the local newspaper’s real estate section trying to determine home value based on curb appeal. The Washington, D.C., market fits his personal preference for vintage style, as Dweck, e-PRO, 28, specializes in historic condos and co-ops.