The family of a gun instructor accidentally killed by a 9-year-old has a video message for the girl, Mediaite reports: "Our dad would want you to know that you should move forward with your life," says Charlie Vacca's 15-year-old daughter, Elizabeth. "You should not let this define you. You should love yourself, and love your family." Says son Christopher, 11: "We don't know your name, but we are connected by this tragedy … someday we hope we can meet you, hug you, and tell you that it's OK." Watch it here. (More shooting stories.)