Blake Morrison has long made a habit of getting to know his closest relatives better only after their death. I don’t mean this unkindly; in life, I’m sure he’s as dutiful and devoted (or not) as the next person. But the grave seems to release him, spurring his deepest thinking, his best writing and (perhaps) his most assiduous, open-hearted loving. In 1993, he published And When Did You Last See Your Father?, in which he exhumed his dad. In 2002, he gave us Things My Mother Never Told Me, about the several lives of his late mother. And here is his third volume. “If you’re reading this, my sister is dead,” he writes on page seven, for the avoidance of doubt.
Morrison turns his attention to his younger sister, Gill,…