ORLANDO, Fla. — A 2-year-old boy shot and killed his father with an improperly stored gun at their east Orange County home last month, Sheriff John Mina said Monday, leading to manslaughter and other charges against the child’s mother. “I can’t emphasize strongly enough that our guns need to be secure and kept out of the hands and away from children at all times,” Mina said at a press conference. “Gun owners that do not properly secure their firearms are just one split second away from one of these tragedies happening in their homes.” Mina said the boy’s 26-year-old father, Reggie Mabry, was f…