Her younger sister Maria married John Ponsonby, Viscount Duncannon, later the 4th Earl of Bessborough, a brother of Lady Caroline Lamb.

When asked why he had never fought a duel to preserve his wife's reputation, Lord Jersey drily replied that this would require him to fight every man in London.

[3] Together, Sarah and George were the parents of seven children:[4] Lady Jersey was one of the patronesses of Almack's, the most exclusive social club in London, and a leader of the ton during the Regency era.

Caroline Lamb ridiculed her in Glenarvon; in revenge Lady Jersey had her barred from Almack's, the ultimate social disgrace.

[7] She is a recurring character in the Regency novels of Georgette Heyer, where she is presented as eccentric and unpredictable, but highly intelligent and observant, and capable of kindness and generosity.