On 27 July 1931, Myddelton was married to Mary Margaret Elizabeth Mercer Nairne (1910–2003), who usually went by the her middle name, Margaret, a daughter of Major Lord Charles Mercer Nairne and his wife, the former Lady Violet Elliot-Murray-Kynymound (daughter of Gilbert Elliot-Murray-Kynynmound, 4th Earl of Minto). Her younger brother was George Petty-Fitzmaurice, 8th Marquess of Lansdowne and she was granted the rank of a marquess's daughter in 1946. After Margaret's father was killed in action at Ypres in 1914, her mother remarried to MP for Dover John Jacob Astor, 1st Baron Astor of Hever (fourth son of William Waldorf Astor, 1st Viscount Astor). From her mother's second marriage, she had three half-siblings, including Gavin Astor, 2nd Baron Astor of Hever and John Astor, MP for Newbury. Together, Lady Margaret and Ririd were the parents of: Capt. David Foulk Myddelton (1932–2021), who married Anne Ratcliffe-Brotherton, daughter of Charles Frederick Ratcliffe-Brotherton, in 1965. After their divorce in 1968, he married Christine Serena Cherry Morris, daughter of Arthur Malcolm Morris, in 1970. Fiona Violet Myddelton, CVO (b. 1934), who married Sir Alastair Sturgis Aird, in 1963. She was Extra Lady-in-waiting to Princess Margaret, Countess of Snowdon between 1960 and 2002. Hugh Robert Myddelton (b. 1938), who married Hon. Sarah Cecily Allsopp, daughter of Maj. Henry Allsopp, 5th Baron Hindlip. Myddelton died on 7 February 1988. Myddelton's seat was Chirk Castle, which was occupied by the family until 2004. Descendants Through his eldest son, he was a grandfather of three: Guy Charles Myddelton (b. 1966), Sian Moyra Myddelton (b. 1971), and Mark Ririd Myddelton (b. 1973). References External links Lt-Colonel Ririd Myddelton (1902-1988) at National Trust Collections Ririd Myddleton on The Peerage Myddleton, Ririd Myddleton, Ririd Ririd Equerries Graduates of the Royal Military College, Sandhurst Knights of the Order of St John Members of the Royal Victorian Order British Army personnel of World War II Coldstream Guards officers People educated at Eton College High Sheriffs of Denbighshire