ATLANTA — Three family members were killed during an apparent robbery at a Grantville gun range Friday, and investigators from multiple agencies worked late into the night at the scene searching for answers to the grim crime. The owner of the Lock Stock & Barrel Shooting range along with his wife and grandson were shot and killed, according to Grantville police. Grantville police told Channel 2 Action News the victims were 75-year-old Thomas Richard Hawk Sr., one of the owners of the family business, 75-year-old Evelyn Hawk and their teenage grandson Luke Hawk. According to the news station, t…