Louis was the 3rd of 14 children of Luke Knight Vail (1836-1894), of London, died NSW & Ann Watson Fraser (1837-1890), of Scotland, died Dargaville
Frances was the 3rd of 14 children of Fairfield Thompson (1844-1923) of Ireland, died Wellington & Elizabeth Jamieson (1850-1912) of Ireland, died Feilding