Baron Kensington is a title that has been created three times, in the Peerages of England, Ireland and the United Kingdom.
Their son William also became Member of Parliament for Haverfordwest and was elevated to the Peerage of Ireland as Baron Kensington in 1776.
Barrett was married to Honorable Isobel Caroline, Lord Kensington's daughter.
Kensington | Baron | South Kensington | William Cecil, 1st Baron Burghley | baron | Sacha Baron Cohen | Joseph Lister, 1st Baron Lister | Joey Baron | Robert Baden-Powell, 1st Baron Baden-Powell | Henry Brougham, 1st Baron Brougham and Vaux | Guy Carleton, 1st Baron Dorchester | Kensington, Maryland | William Wallace, Baron Wallace of Saltaire | William Tyssen-Amherst, 1st Baron Amherst of Hackney | James Mackay, Baron Mackay of Clashfern | Hercules Robinson, 1st Baron Rosmead | George Brydges Rodney, 1st Baron Rodney | Beechcraft Baron | Thomas Seymour, 1st Baron Seymour of Sudeley | Thomas Denman, 1st Baron Denman | Stuart Rendel, 1st Baron Rendel | Norman Foster, Baron Foster of Thames Bank | Kensington Palace | John Moore-Brabazon, 1st Baron Brabazon of Tara | Charles Cochrane-Baillie, 2nd Baron Lamington | Charles Calvert, 5th Baron Baltimore | Benedict Calvert, 4th Baron Baltimore | Baron Hans Heinrich Thyssen-Bornemisza | William Ponsonby, 1st Baron Ponsonby | Walter Rothschild, 2nd Baron Rothschild |