For the Waterston family, Christmastime at the hotel Rosita de Hornedo in 1958 was just as it had always been. The children swam in the hotel’s two pools, played in the sandlot with their Cuban cousins, and trekked the rocky walkway next door to the Casino Deportivo, a country club where even kids could play the slot machines. To them, there was little outward sign Batista would soon be out, Fidel in.