 Her brothers Henry Brooke, 11th Baron Cobham and Sir George Brooke were arrested by Cecil for their involvement in the "Main" and "Bye" plots.Sir George Brooke, her younger brother, was executed at Winchester on 5 December 1603 for high treason.In 1608, Frances Cecil caught the eye of Elizabeth Stuart, Queen of Bohemia, daughter of the king, and she made Sir John Harington write to Salisbury to invite her to join her household.