Princess Mary Adelaide of Cambridge
Princess Mary Adelaide Wilhelmina Elizabeth of Cambridge (27 November 1833 - 27 October 1897) was a granddaughter of George III of the United Kingdom. She later married the Duke of Teck. She was also the mother of Mary of Teck, and grandmother to Edward VIII later Duke of Windsor  George VI and great grandmother to the current Queen  Elizabeth II therefore mother-in-law of George V.