Career
He lived in New York City at 1 Broadway in the Kennedy mansion until he was recalled to succeed to the Earldom on the death of the 10th earl, who had died without male issue. They had three children:
Archibald Kennedy, 1st Marquess of Ailsa (1770–1846)
Honorary John Kennedy (1771–1859)
Honorary
Robert Kennedy (1773–1843) m.
22 March 1794 Jane Macomb daughter of merchant Alexander Macomb and Catherine Navarre. (Sophia Eliza, daughter of Robert and Jane (Macomb) Kennedy, married John Levett of Wychnor Park and Packington Hall, Staffordshire.
His great-grandsons included Sir John Gordon Kennedy Knight Commander of St. Michael and St. George (1836–1912), who became an eminent diplomat, Admiral Sir William Robert Kennedy Knight Grand Cross of the Bath (1838–1916), who became Commander-in-Chief, The Nore, and Gilbert George Kennedy (1844–1909) who played for the Scottish XI in the second international football match against England. He succeeded to the titles of 11th Earl of Cassilis, and 13th Lord Kennedy on 18 December 1792.
Cassilis was appointed Major Commandant of the Loyal Carrick Volunteers in early 1797.
