The slain victims of Monday’s Highland Park parade massacre include a married couple in their 30s who left behind a 2-year-old son – who’d been found under his dead father during the mayhem. Irina McCarthy, 35, and her husband Kevin McCarthy, 37, were at the parade with their toddler Aiden when a gunman disguised in women’s clothing opened fire on the Fourth of July celebration, turning the typically joyous event into a blood-soaked nightmare, officials said. The couple were among seven innocent people shot dead during the mayhem. Their son was discovered under the body of his mortally wounded father...