Question: Who is American writer and translator Peter Christopher Sebastian's older brother who is a novelist and poet and wrote "Darconville's Cat"?
Sentence (from "J.-H. Rosny jeune"): Rosny was the pseudonym of Séraphin Justin François Boex (July 21, 1859 – July 21, 1948), a French author of Belgian origin who, along with his better known older brother J.-H.
Relevant evidence: No