Many parents devote the bulk of their energy to preparing their children for life out in the real world. So what should those parents do once the kids have left the house? This hour, we’ll talk about how to refocus our lives once children are all grown up with Melissa T. Shultz, who writes about the idea in her memoir, “From Mom to Me Again: How I Survived My First Empty-Nest Year and Reinvented the Rest of My Life” (Source Books).