Lord Cholmondeley married (Sarah) Rose Hanbury, a 25-year-old fashion model turned researcher,[4] on 24 June 2009, their engagement having been announced the previous day. She is a daughter of Tim Hanbury, a website designer, and his fashion designer wife, Emma. Her paternal grandmother is Lady Rose Lambert, daughter of the 10th Earl of Cavan: she was one of the bridesmaids at the 1947 wedding of Princess Elizabeth.
The announcement that Lady Cholmondeley was expecting twins was revealed by Richard Kay of the Daily Mail[5] and Mandrake of The Daily Telegraph. On 12 October 2009, the Marchioness gave birth to twin sons, Alexander Hugh George and Oliver Timothy George,[6][7] who were originally expected in January. The birth took place shortly after Lady Cholmondeley was rushed to Queen Charlotte's Hospital in London, where she was monitored for two weeks. The elder son, Alexander, as heir-apparent to the Marquessate, bears the courtesy title of Earl of Rocksavage; his brother is known as Lord Oliver Cholmondeley.[8] In March 2016 the Marquess and Marchioness had their third child, a daughter, Lady Iris Marina Aline Cholmondeley.