“Gone Parents“: Poets featured today consider deceased parents, somewhat sentimentally or as mysterious dream figures. Ted Kooser, “Mother” and “Father,” from Delights & Shadows (Copper Canyon Press, 2004). Seamus Heaney, “Uncoupled,” from Selected Poems 1988-2013 (Farrar, Straus and Giroux, 2014; originally published in Human Chain (2010). Kathleen Flenniken, “The Sound of a Train,” from Famous (U. of Nebraska Press, 2006), used with the kind...