Mary Pelham, Countess of Chichester British noble (1776–1862) Parents Amelia Osborne, Marchioness of Carmarthen Francis Osborne, 5th Duke of Leeds Children Lady Catherine Pelham Henry Pelham, 3rd Earl of Chichester Frederick Thomas Pelham Lady Amelia Pelham John Pelham Lady Lucy Pelham Siblings Augusta Leigh George Osborne, 6th Duke of Leeds Francis Osborne, 1st Baron Godolphin Catherine Osborne Lord Sidney Osborne Partners Thomas Pelham, 2nd Earl of Chichester
