He was the son of Sir Fiennes Cecil Arthur Barrett-Lennard, Chief Justice of Jamaica, son of Captain Thomas George Barrett-Lennard, son of the first marriage George Barrett-Lennard, son of John Barrett-Lennard, second son of the first Baronet.
They had one son, Hugh, who subsequently inherited the Barrett-Lennard baronetcy.
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He was the fifth son of Sir Thomas Barrett-Lennard, 1st Baronet, and Dorothy St. Aubyn and a grandson of Baron Dacre of Belhus in County Essex, England.
His mother, Elaine Baptiste was from Willikies, Antigua, while his father, Lennard Baptiste, was originally from the town of Castle Bruce, Dominica.
Barrett-Lennard's father, Sir Fiennes Cecil Arthur Barrett-Lennard (1880–1963), was a British soldier, who fought in the Boer War and in East Africa in the First World War, and became a judge in Malaya, then Johore and Kedah, and finally Chief Justice of Jamaica.
The most valuable item in the collection was a portrait of Thomas Barrett-Lennard, 17th Lord Dacre, with his wife and daughter by Pompeo Batoni which was valued at £2.5m.
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In 1922, the collection included portraits of Charles I and Catherine Mildmay, both by Cornelis Janssens van Ceulen, but these are not included in the Essex Record Offic List.
Sir Thomas Barrett-Lennard, 1st Baronet (1761–1857), British politician, MP for Essex South 1832–1835
The electrostatic interaction is modeled using Coulomb's law and the dispersion and repulsion forces using the Lennard-Jones potential.
Thomas Robert Keppel (1811 – 1863), married Frances Barrett-Lennard, daughter of Sir Thomas Barrett-Lennard, 1st Baronet and had issue.