Bentinck married, firstly, Georgiana Augusta Frederica Seymour (baptised Elliott) (1782 – 10 December 1813), daughter of the courtesan Grace Elliott on 21 September 1808; she was said to be a daughter of the Prince of Wales or of the 4th Earl of Cholmondeley, both men claiming her paternity.
[6] They had one daughter, who was raised after Georgiana's death by Lord Cholmondeley at Cholmondeley Castle: The marriage enabled Bentinck to become Treasurer of the Household in 1812, a position he held till death, despite his involvement in a notorious divorce suit and his subsequent remarriage.
During the discussion of the divorce bill, the customary provision against remarriage was struck out in the House of Lords.
Anne and Lord Charles were married on 23 July 1816, enabling their first child (which she was expecting) to be born legitimate three weeks later.
[11] Bentinck collapsed and died suddenly at age 45 while undressing at his apartment in Park Lane, and was quickly discovered by his footman.