Nerissa and Katherine Bowes-Lyon

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Nerissa Jane Irene Bowes-Lyon (18 February 1919 – 22 January 1986) and Katherine Juliet Bowes-Lyon (4 July 1926 – 23 February 2014) were two mentally disabled daughters of John Herbert Bowes-Lyon and his wife Fenella (née Hepburn-Stuart-Forbes-Trefusis). John was the brother of Queen Elizabeth the Queen Mother, thus his two daughters were the maternal first cousins of Queen Elizabeth II and Princess Margaret, sharing one pair of grandparents, Claude Bowes-Lyon, 14th Earl of Strathmore and Kinghorne, and Cecilia Bowes-Lyon, Countess of Strathmore and Kinghorne.

Read on Wikipedia · Image Edmund Evans, Public domain