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.
Roland Cubitt, 3rd Baron Ashcombe
Roland Calvert Cubitt, 3rd Baron Ashcombe, (26 January 1899 – 28 October 1962) was a member of the British aristocracy.
He became Baron Ashcombe on the death of his father Henry Cubitt, 2nd Baron Ashcombe, in 1947.
He is also the maternal grandfather of Camilla, Duchess of Cornwall (born Camilla Shand), now the wife of Charles, Prince of Wales.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Rosalind Shand
Rosalind Maud Shand(" née" Cubitt; 11 August 1921 – 14 July 1994) was the daughter of Roland Cubitt, 3rd Baron Ashcombe.
She was the wife of army officer Major Bruce Shand and the mother of Camilla, Duchess of Cornwall.
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.
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.
Henry Cubitt, 2nd Baron Ashcombe
Henry Cubitt, 2nd Baron Ashcombe (14 March 1867 – 27 October 1947), was a British politician and peer, the son of George Cubitt, 1st Baron Ashcombe, and his wife Laura Joyce.
Camilla, Duchess of Cornwall
Camilla, Duchess of Cornwall,( born Camilla Rosemary Shand, later Parker Bowles; 17 July 1947) is a member of the British royal family.
She is the second wife of Charles, Prince of Wales, heir apparent to the British throne.
Instead of using the title Princess of Wales, she uses the title Duchess of Cornwall, her husband's secondary designation.
In Scotland, she is known as the Duchess of Rothesay.
Camilla is the eldest child of Major Bruce Shand and his wife Rosalind Cubitt, the daughter of Roland Cubitt, 3rd Baron Ashcombe.
She was raised in East Sussex and South Kensington in England, and was educated in England, Switzerland, and France.
In 1973, Camilla married British Army officer Andrew Parker Bowles, with whom she has two children.
They divorced in 1995.
Camilla was periodically romantically involved with the Prince of Wales both before and during their first marriages.
The relationship became highly publicised in the media and attracted worldwide scrutiny.
In 2005, it culminated in a civil marriage at Windsor Guildhall, which was followed by a televised Anglican blessing at St George's Chapel, Windsor Castle.
As Duchess of Cornwall, Camilla assists the Prince of Wales on his official duties.
She is also the patron, president and a member of numerous charities and organisations.
Since 1994, she has taken action on osteoporosis, earning honours and awards.
She has also raised awareness in areas including rape and sexual abuse, literacy, animal welfare and poverty.
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.
Henry Cubitt, 4th Baron Ashcombe
Henry Edward Cubitt, 4th Baron Ashcombe( 31 March 1924 – 4 December 2013), was a British peer.
He was the son of Roland Cubitt, 3rd Baron Ashcombe, and Sonia Rosemary Keppel, and the uncle and godfather of Camilla, Duchess of Cornwall.

Question: Who is the paternal grandmother of Roland Cubitt, 3Rd Baron Ashcombe?
Answer: Laura Joyce