A father in Florida has been arrested after his 9-year-old son found his gun and shot his 5-year-old brother in the chest. Robert Giles has been charged with one count of culpable negligence by leaving a firearm within easy reach of a minor, according to Manatee County court records viewed by Us Weekly. The incident took place at a residence in Palmetto on March 25. Deputies reported to the home after they received a report about a “shooting wit…