Frances Finch Countess of Weymouth (1650–1712) Parents Heneage Finch, 3rd Earl of Winchilsea Lady Mary Seymour Children William Thynne Henry Thynne Frances Thynne James Thynne Siblings Heneage Finch, 5th Earl of Winchilsea William Finch, Viscount Maidstone John Finch, 6th Earl of Winchilsea Leopold Finch Partners Thomas Thynne, 1st Viscount Weymouth