In the novel Elephants Can Remember, Captain Jarrow was the husband of Dolly, the twin sister of Margaret Ravenscroft. They had two children but he died some time before the events in the book in an accident.
According to Dr Willoughby Junior, Captain Jarrow and his wife had seemed to have a thoroughly happy marriage. Captain Jarrow had been pleased when his wife became pregnant with their second child. However, he died when both children were very young.