Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.
Archibald I, Lord of Douglas
Archibald of Douglas( before 1198 – d.c. 1238) was a Scottish Nobleman.
He was the son of William of Douglas.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Mona Hopton Bell
Mona Hopton Bell( 1867- 1940) was a British artist, best known for her portraits of civic figures.
She was the grandmother of the painter Jean H. Bell.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Kaoru Hatoyama
After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama.
George Carnegie, 9th Earl of Northesk
Lieutenant-Colonel George John Carnegie, 9th Earl of Northesk DL (1843 – 1891) was a British nobleman and soldier.
He was born the son of William Carnegie, 8th Earl of Northesk and Georgiana Maria Elliot on 1 December 1843.
He died on 9 September 1891 at age 47.
Lord Rosehill, as he then was, was commissioned into the 1st Dragoons in 1862, but transferred to the Scots Fusilier Guards as a Lieutenant later the same year.
He was promoted Captain in 1866 and Lieutenant-Colonel in 1873.
He retired in 1874.
He married Elizabeth Georgina Frances Elliot, daughter of Admiral Sir George Elliot and Hersey Susan Sydney Wauchope, on 28 February 1865 and had four children.
He rebuilt Longwood House, Hampshire, his main home.
The architect was George Devey.
Anne Denman
Anne Denman( 1587–1661) was born in Olde Hall, Retford, Nottinghamshire.
Through a fortunate second marriage with Thomas Aylesbury, she became the grandmother of Lady Anne Hyde, Duchess of York and great- grandmother of Queen Mary II and Queen Anne.
Douglas Carnegie
Lieutenant-Colonel Douglas George Carnegie (4 January 1870 – 27 February 1937) was a British politician.
He was the son of Lieutenant-Colonel George Carnegie, 9th Earl of Northesk and Elizabeth Georgina Frances Elliot.
Carnegie was commissioned into the 3rd (Militia) Battalion, Gloucestershire Regiment in 1888.
He resigned his commission as a Major in 1905.
From 1917 to 1918 he served with the Labour Corps and was promoted Lieutenant-Colonel.
He married Margaret Jean Johnstone-Douglas, daughter of Arthur Henry Johnstone-Douglas and Jane Maitland Stewart, on 26 April 1894 and had four children:
Gülbahar Hatun (wife of Mehmed II)
Gülbahar Hatun( 1432 – 1492) was the consort of Sultan Mehmed II, and mother of Sultan Bayezid II of the Ottoman Empire and the grandmother of Selim I.

Question: Who is the paternal grandmother of Douglas Carnegie?
Answer: Georgiana Maria Elliot