CHICAGO — Echaka Agba and Adhana Reid read the parts of Joy and Eva, a mother-daughter duo in the play “Southside Summer,” describing at his funeral how the character Eva’s younger brother Emmanuel was killed. “Emmanuel loved running around the house, staring out at the world before him,” Agba said to a crowd of about 50 people at the Goodman Theatre on Wednesday night. “Every day during the summer, he’d watch the other kids play, occasionally asking me if he could go outside. Though he knew I would say, ‘No. It’s not safe. Maybe tomorrow.’” The play goes on to describe Emmanuel and his sister…