Two of Hashem Ahmad Alshilleh’s children, Rayah, left, and Mahmoud, both police officers, place flowers at their father’s grave at Westminster Memorial Park Mortuary. “This is all my father’s legacy,” said Mahmoud, a 25-year-old Corona Police Department officer, as he waited for his siblings to arrive. He buried my father, my friend.’” “There’s no Muslim family in Orange County or …