The Reeves sisters, Ellie and Rachel. Photo by Conor O'Leary Rachel and Ellie Reeves, two powerhouses of Keir Starmer’s Labour Party, are enjoying a conspiratorial giggle over a pot of tea. It’s not immediately obvious from their speeches in the House of Commons that the sisters hail from south London, but the Lewisham accent surfaces when they’re together at a café, reminiscing about their school days. In the pair’s first joint interview, Ellie jokes that her older sibling, the shadow chancellor, was “more like a pushy parent” than a sister: “You gave me extra homework and made sure I behaved.”...