A timeline of where the 14-year-old Georgia high school student lived in a short period of time sheds light on his tumultuous home life.Colt Gray, 14, and his father, Colin Gray, 54, are charged in the killings of two students and two teachers at Apalachee High School in Barrow County. Nine others were hurt, with seven of the injured shot.The teen's childhood was unstable, with the young teen moving to at least three rental homes in a short period of time.According to the teen's father, in recently released police interrogation transcripts, " gone through a lot," with Colin Gray saying