“How, I asked, could I have gone my whole life not knowing about my mother? How could I have not known what Keith knew when he saw our house? “It’s your mom,” Helder said. “Because it’s Mom.” He sounded firm and knowing and clear. “When a child has an alcoholic father, he sees him drink all day long but he doesn’t have a label, a concept. You just know that at night, when the tires make a certain sound in the driveway and the doors slam a certain way, with a certain sound, you just know you need to hide.”