My grandfather, his older brother (died at age 5 from menengitis), and his two older sisters were born in Mielec. That had a fairly common last name--Neustadt. They immigrated to the United States in 1920, but my great-grandfather's siblings and their families stayed behind. The city was massacred twice by the Nazis during the Holocaust, and the entire Jewish population was destroyed, my family included. Is there any way to find out who they were?