Photo: Marc J. Franklin The expectations of genre may at once signify an imposing edifice that a playwright might stretch themselves to fulfill, and simultaneously, a familiar model to which they can retreat for comfort and direction — something like a family home, especially the one onstage at the Hayes Theater in Purpose . In the multilevel, coral-colored Chicago mansion that is Todd Rosenthal’s set, cut through with a drama-ready spiral staircase, lies the accumulated evidence of the Jasper