On 04 Mar 1792 John Hamilton 1st Marquess Abercorn (age 35) and Cecil Hamilton Marchioness Abercorn (age 21) were married. She by marriage Marchioness Abercorn. They were divorced in Apr 1799. She married the Joseph Copley 3rd Baronet (age 22) the following month; he being the brother of the Marquess' first wife Catherine Moyle Marchioness Abercorn. They were first cousins.

In 1800 John Hamilton 1st Marquess Abercorn (age 43) and Anne Jane Gore Marchioness Abercorn (age 36) were married. She by marriage Marchioness Abercorn. She the daughter of Arthur Saunders Gore 2nd Earl Arran (age 65) and Catherine Annesley.