Keeping a family together is hard enough. Now try adding a chimp. Over the decades, psychologists exploring the animal-human cognitive divide have launched a number of studies in which humans attempted to raise chimpanzees as children. With their often-sloppy science and often-sorry outcomes (see, for example, the documentary film “Project Nim”), most such experiments have done less to limn the inter-species boundary than to highlight our confusions about it.

These studies also trace the larger tale of familial dreams and disappointments in general, a point brought achingly to life in Karen Joy Fowler's latest novel, “We Are All Completely Beside Ourselves.” It's the saga of one chimped-up family and its inevitable dissolution. Karen and I talked about the troubled history of chimp cross-fostering experiments, about the splintering of families, of siblings and selves, and storytelling as a source of self-knowledge, real or illusory.