“Writers’ offspring tend to go into the family business with far less regularity than, say, the children of doctors or lawyers, and it seldom happens that over the long haul, and in the deepening shade, the younger equals or outstrips the elder — the way that Anthony Trollope, to take a famous example, bested his mother, Fanny. The exception these days is the curious writerly firm of Amis & Amis, founded by Kingsley, who died in 1995, and now run by his son Martin.”