Guest host David Sedaris presents two stories about family pressures. Patricia Highsmith is best known as a thriller writer but “The Door is Always Open and the Welcome Mat is Out” is a wonderful character study of a working woman nervously entertaining a judgmental sister. Tandy Croyn reads. In Tobias Wolff’s “Powder,” it’s a father and son, taking an exhilarating drive in a snow storm. SHORTS late host Isaiah Sheffer was the reader.