A couple and their grandson from Southeast Oklahoma were killed in a three vehicle crash in Collin County. State Troopers said a sedan headed northbound on State Highway 121 in Trenton crossed into the southbound lanes, sideswiped one vehicle and then struck an SUV. The DPS said the driver of the sedan, identified as 65-year-old James Wilkerson, died at the scene along with passenger, 70-year-old Mary Wilkerson, 70. A third passenger in that vehicle, 17-year-old Christopher Wilkerson, died later at a hospital All three victims were from Durant. There were no major injuries to the occupants of the other vehicle.