Nearly a century ago, during the Spanish Civil War, a group of parents put five hundred of their children on a boat and sent them across the ocean to find safety in Mexico. Few of the refugees ever saw their parents again. The youngest of the children was Rosita Daroca Martinez, who was just three. On this week’s show, her granddaughter, the writer and radio producer Destry Maria Sibley, traces the impact of her grandmother’s trauma down through the generations. Plus, the immigration reporter Jonathan Blitzer ties the story to today’s refugee crisis at the U.S. southern border, where a surge in arrivals has put the Biden Administration on its heels.