Her daughter Corisande Armandine Léonie Sophie de Gramont married Charles Bennet, 5th Earl of Tankerville, and another daughter, Aglaé Angélique Gabrielle de Gramont, was married in turn to Russian general Alexander Lvovich Davydov and French diplomat Horace Sébastiani.
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The 5th Earl, Charles Augustus, who was born on 28 April 1776 was treasurer of the household during the short administration of Mr Fox in 1806.
One of his first works was the cataloguing of the collection of the Earl of Tankerville.
Bennet was the second of three sons and fourth of eight children of Charles Bennet, 4th Earl of Tankerville, and his wife, Emma (1752–1836), daughter of banker Sir James Colebrooke, 1st Baronet.
Later, Joseph Banks named the plant in honour of Lady Emma Tankerville, as the orchid flowered in her greenhouse at Walton-on-Thames near London.