Cromer married the Hon. Esmé Mary Gabriel Harmsworth (1922–2011) in 1942, daughter of
Esmond Harmsworth, 2nd Viscount Rothermere. They had three children: • Lady Lana Mary Gabriel (1943–1974); •
Evelyn Rowland Esmond (born 1946), who succeeded as 4th Earl of Cromer; and • Hon. Vivian John Rowland (born 1950), married his second cousin Lavinia Baring. Both the Countess of Cromer and her daughter-in-law were royal attendants. Esmé Harmsworth was a Lady of the Bedchamber to
Queen Elizabeth II, while Lavinia Baring was a Lady-in-Waiting to
Diana, Princess of Wales. In 1964, during the period he was at the Bank of England, Cromer purchased a Fairey Huntsman 28 sports cruiser from Fairey Marine, Hamble. Bearing the name
Le Reve, the vessel was taken to France. The boat still exists, and details can be seen on the Fairey Owners Club website. The 3rd Earl died on 16 March 1991 in London. The Countess remarried in 1993 to Gerrit van der Woude. ==Arms==