John William married on 3 April 1877, at
St George's, Hanover Square, London, England, his second cousin, Ernle Elizabeth Louisa Maria Grosvenor Burton (later, in 1906, by Royal Licence, Plunkett-Ernle-Erle-Drax), the only daughter and heir to Colonel Francis Augustus Plunkett Burton, Coldstream Guards, by Sarah Elizabeth, younger daughter and coheir of
John Samuel Wanley Sawbridge-Erle-Drax, of Charborough Park,
Dorset. Ernle Burton's paternal grandmother, Anna Maria Plunkett, wife of Admiral
James Ryder Burton, was a sister of her husband's paternal grandfather,
Edward Plunkett, 14th Baron Dunsany. In addition, Ernle, Lady Dunsany, was descended via her maternal line from James Drax, a young Englishman who, with a few hundred pounds, had sailed from the Port of London for Barbados in the late 1620s. There he had made a fortune developing sugar and slave-trading into a hugely profitable business. Just before the turn of the seventeenth century, the family returned to England and purchased an estate in Dorset. Lady Dunsany inherited Charborough Park in 1905. Her unusual Christian name,
Ernle, was inherited from an ancestress, Elizabeth
Ernle (1697–1759), wife of Henry Drax, Esq., who was the daughter and eventual heiress of
Sir Edward Ernle, 3rd Baronet, P.C., M.P., (1673–1729) of Maddington, Wiltshire, by his wife, Frances (d. 1728) only daughter and heir of Lieutenant General
Thomas Erle (1650–1720), of Charborough House, the source of a further barrel of her surname. John William and Ernle Elizabeth had two sons, the author
Edward John Moreton Drax, 18th Baron of Dunsany and Admiral Sir
Reginald Aylmer Ranfurly Plunkett-Ernle-Erle-Drax (Charborough Park was left to Reginald, who changed his name to include Drax, the family who had formerly owned it, as well as including references to the
Ernle and Erle families from which various of his mother's legacies to him came). Lady Dunsany was a cousin of
Sir Richard Burton, the great traveller, scholar, writer, and translator of the
Arabian Nights. Her son and heir, Edward, the noted author, may have inherited his imaginative streak partly from the Burton family. ==Personal life==