Following his first wife's death in 1816, he married, on 29 October 1825, the widowed Marianne (Caton) Patterson (died 1853), whose mother Mary was the daughter of Charles Carroll of Carrollton, the last surviving signatory of the United States Declaration of Independence; her former sister-in-law was Elizabeth Patterson Bonaparte. Wellington, who was very fond of Marianne (rumour had it that they were lovers) and was then on rather bad terms with his brother, pleaded with her not to marry him, warning her in particular that "The Parasites", (Richard's children by Hyacinthe) would see her as an enemy. The Duke's concern seems to have been misplaced; they had no children, but the marriage was a relatively happy one - "much of the calm and sunshine of his old age can be attributed to Marianne".