Vanished: Left Behind - Next Generation (2016) online

When a billion people around the globe suddenly vanish and chaos engulfs the nation -- headstrong 15-year-old Gabby is thrust into adulthood way too soon. The event forces Gabby, along with her younger sister Claire and the two teen boys vying for Gabby's affection, Josh and Flynn - to try to figure out what has happened and how they fit into this dangerous new world.