 He proved his right to vote at the elections of Representative Peers (Ireland) 1890 and Representative Peers (Ireland) 1893–99.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 Ernle-Erle-Drax), the only daughter and heir to Colonel Francis Augustus Plunkett Burton, Coldstream Guards, by Sarah Frances Elizabeth, younger daughter and coheir of John Samuel Wanley Sawbridge-Erle-Drax, of Charborough Park, Dorset.Ernle Burton's paternal grandmother, the Hon.