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.
Diana Guardato
Diana Guardato was a member of the aristocratic Patrician Guardato family, and had three children with King Ferdinand I: Diana Guardato is the 16th- Great Grandmother of His Royal Highness Albert II of Belgium, 15th- Great Grandmother of His Majesty Juan Carlos
I of Spain, 17th- Great Grandmother of Philippe of Belgium, 14th- Great Grandmother of His Majesty Manuel II of Portugal, 16th- Great Grandmother of Grand Duke Henri, as well as many others.
Grigoriy Gruzinsky
Grigoriy Ilyich Gruzinsky  (1833–1899) was a Georgian royal prince ("batonishvili") of the Bagrationi dynasty.
Grigoriy was son of Prince Ilia of Georgia and grandson of King George XII of Georgia.
He was aide to the Emperor of Russia from 1860 to 1863.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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.
Prince Ilia of Georgia
Ilia ("Iliya Georgiyevich"), also known as Elizbar (ელიზბარი), (2 September 1790 – 18 July 1854) was a Georgian prince royal ("batonishvili"), a son of George XII, the last king of Kartli and Kakheti, by his second marriage to Mariam Tsitsishvili.
After the Russian annexation of Georgia in 1801, Ilia accompanied her mother into exile to Russia.
He then received military training and served in the Russian army, fighting with distinction at the battle of Borodino against the French in 1812 and retiring with the rank of colonel in 1823.
He had 13 children of his marriage with Princess Anastasia Obolenskaya and his descendants, bearing the surname of Gruzinsky, have survived in the 21st-century Russian Federation.
Purnima (Hindi actress)
Purnima Das Verma( born Meherbhano Mohammad Ali) was an Indian film actress who worked predominantly in Hindi language films.
She is the grandmother of actor Emraan Hashmi.
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.
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.
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.

Question: Who is Grigoriy Gruzinsky's paternal grandmother?
Answer: Mariam Tsitsishvili