The Venezuelan diaspora is one of the most vexing migration challenges facing the U.S. secretary of state and the homeland security secretary when they meet Mexico’s president Wednesday to discuss unprecedented arrivals at the border. Venezuelans topped all nationalities in border arrests in September. That was just before the U.S. resumed deportation flights to Venezuela. The travails of one family offer a window into how those deportation flights are playing out: Pedro Naranjo is in Venezuelan military prison. His father waits in U.S. immigration detention. They have been separated by the overstretched U.S. immigration system.