CHICAGO — Standing near the gravestone for the relative he never met, Mark Bailey accepted the crisply folded American flag from the Army officer, hugged it to his chest and closed his eyes. Though the person he called his aunt — born Reba Caroline Bailey — had been estranged, missing for decades and died in 2015 as an unidentified ward of the state, he felt connection and a sense of closure. “I want to let Reba know we’re part of the circle and part of the family,” he said. Mark Bailey was