By Brendan O’Brien and Tom Polansek HIGHLAND PARK, Ill. (Reuters) – A teacher at a synagogue and a grandfather in his 70s who came from Mexico to visit his family were among the six people killed in the shooting at a Fourth of July parade in Chicago suburb Highland Park, according to family and friends. Nicolas Toledo was the first victim identified by family members after a gunman on a rooftop opened fire on families at the parade on Monday, killing six and wounding more than 36. “My grandfather Nicolas Toledo father of eight and grandfather to many left us this morning July 4th, what was sup…