U.S. Magistrate Judge Jeffrey I. Cummings, who was formally installed as a judge Friday afternoon, was the first in his family to graduate law school.His father, Nelson, was the only African American student when he briefly attended Marquette University Law School before he had to choose between enlisting in the military or being drafted. His mother, Marlene, was a psychiatric nurse who was human relations expert, a TV personality and a writer.His parents — along with his three brothers, sister, aunts, cousins and nieces …