Evil Seed - Powerful Ben Marcus story in current New Yorker

I've read a few Ben Marcus stories along the way and tho I don't have a clear, specific recollection of any particular story - blame me for that, not him - I do recall thinking that his early stories were formally experimental - not especially appealing to me - but his new story in the current New Yorker, Cold Little Bird, is a terrific story that shows a real maturation of his style - sometimes really talented writers get pushed to publication too early (if that's possible) when they don't have substantial life experience on which to draw, perhaps, so they revert to formalism and experimentation (as I did when a young and aspiring writer). This story shows that early faith in Marcus's talent was well placed. this story is about a young couple and their older (10 years old) son, Jonah, who quite suddenly and unexpectedly asks them not to touch him and become cold, analytic, and isolated - at least at home, though there is no evidence of aberrant behavior at school or among his peers. (He also asks his parents not to call him by friendly nicknames, e.g., pal, buddy, champ...) The story is spooky and strange, almost on the verge of the supernatural - you wonder if the child is possessed in some way - though you also wonder what exactly is wrong with this child. We hear stories of children who suddenly become autistic or withdrawn and strange following vaccination, but those stories have always seemed to me unsubstantiated and polemical - but there's no evident explanation, within the boundaries of this story, for the sudden change in personality. Among other things, creepily, Johan unexpectedly begins to take care of his younger brother (to whom he had previously been indifferent) and develops a fascination with anti-Semitic right-wing writings (he uses a gift card to buy a book arguing that Jews orchestrated the 9-11 attack; Jonah and his parents, as you might surmise, are Jewish). The story is primarily about the effect of this transformation on the parents, the father in particular - especially when at one point Jonah threatens to tell the school psychologist/counselor that his father is touching him even though he's asked him not to do so. That lays another penumbra across the story - is the father/narrator being straightforward with us? Maybe there is some abuse going on here? - and then we as readers are torn: Are we guilty of leaping to conclusions? Or is the dad manipulating us, telling us a part of the story only? Like many stories, this one is "open" at the end, without an obvious conclusion or resolution, but unlike many "open" stories this one leaves us in shock and suspense - and one can't help but wonder, if in the same situation, what would I do, how would I cope - what would it be like to have your child turn against you for no evident reason?