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.
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.
Robert Petre, 9th Baron Petre
Robert Edward Petre, 9th Baron Petre( March 1742 in Ingatestone Hall – 2 July 1801) was a British peer.
Lord Petre was the son of Robert Petre, 8th Baron Petre( 1713–1742), a renowned horticulturist, and Lady Henrietta Anna Mary Barbara Radclyffe( 1714 – 1760), daughter of the 3rd Earl of Derwentwater( 1689 – 1716) who was the grandson of Charles II by his mistress Moll Davis.
Lord Petre was a member of the English Roman Catholic nobility, a philanthropist and responsible for employing James Paine to design a new Thorndon Hall and a house in Mayfair.
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.
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.
William Petre, 11th Baron Petre
William Henry Francis, 11th Baron Petre( 22 January 1793 – 3 July 1850) was an English nobleman, based in Essex.
He was the first Baron Petre to take his seat in the House of Lords after the passing of the Catholic Relief Act 1829.
Robert Petre, 7th Baron Petre
Robert Petre, 7th Baron Petre (1689 – 22 March 1713) was a British peer, the son of Thomas Petre, 6th Baron Petre (1633–1706) and his wife Mary Clifton, daughter of Sir Thomas Clifton.
He succeeded to his title, at the age of 17, upon the death of his father.
Robert is said to have spurned wearing a wig in the conventional way, spending instead six hours every day dressing his own hair.
He caused an uproar of indignation and outrage in the family when, in 1711, being then only 21, in a freak of gallantry cut off a lock of hair from the head of a celebrated beauty, his distant cousin, Arabella Fermor, daughter of Henry Fermor of Tusmore, Oxfordshire.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Robert Petre, 8th Baron Petre
Robert James Petre, 8th Baron Petre (3 June 1713 – 2 July 1742) was a renowned horticulturist and a British peer.
Lord Petre was the son of Robert Petre, 7th Baron Petre (1689–1713) and his wife Catherine Walmesley (1697 – 31 January 1785), heiress of the Walmesley family of Lancashire.
Petre was born three months after his father's death and spent his childhood at Ingatestone Hall, instead of at Thorndon Hall, the family seat, as his grandmother was still in residence there.

Question: Who is Robert Petre, 8Th Baron Petre's paternal grandmother?
Answer: Mary Clifton