Marcia Anderson-Pelham, Countess of Yarborough

Marcia Amelia Mary Pelham, Countess of Yarborough and 13th Baroness Conyers, 7th Baroness Fauconberg and 9th Countess of Mértola, OBE (18 October 1863 – 17 November 1926) Her brother Sackville FitzRoy Henry Lane-Fox died unmarried in 1879 (before their father's death) and her sister was Violet Herbert, Countess of Powis, later suo jure Baroness Darcy de Knayth. Due to the peerages which thus came to her, Marcia Pelham brought 153 armorial quarterings to her husband's family.

In 1920, the countess was appointed an Officer of the Order of the British Empire in recognition of her role as Commandant of Brocklesby Hall, her husband's ancestral home, which had served as an auxiliary hospital during the First World War.

Charles Pelham, Lord Worsley (1887–1914), who married Alexandra Mary Freesia Vivian (1890–1963), fourth daughter of Hussey Vivian, 3rd Baron Vivian. He was killed in action not long after the beginning of the First World War, aged 27. Her peerages were inherited by the elder of her two surviving sons, Sackville.