Viscount Chelmsford

Sir Frederic Thesiger (died 1805), uncle of the first baron, was a captain in the Royal Navy and served as Aide-de-Camp to Lord Nelson at the Battle of Copenhagen in 1801.

His eldest son George Thesiger was a temporary Major-General in the Army and was killed in the First World War.

Sir Edward Pierson Thesiger (1842–1928), fourth son of the first Baron, was Clerk-Assistant to Parliament from 1890 to 1917.

Wilfred Gilbert Thesiger (1871–1920), third son of the second Baron, was Consul-General and Minister Plenipotentiary to Addis Ababa.

[citation needed] His eldest son Sir Wilfred Thesiger was an explorer and travel writer.