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.
Bayezid I
Bayezid I ((nicknamed Yıldırım (Ottoman Turkish: یلدیرم), "Lightning, Thunderbolt"); 1354 – 8 March 1403) was the Ottoman Sultan from 1389 to 1402.
He was the son of Murad I and Gülçiçek Hatun.
He built one of the largest armies in the known world at the time and unsuccessfully besieged Constantinople.
He adopted the title of Sultan-i Rûm, Rûm being an old Islamic name for the Roman Empire.
He decisively defeated the Crusaders at Nicopolis (in modern Bulgaria) in 1396, and was himself defeated and captured by Timur at the Battle of Ankara in 1402 and died in captivity in March 1403, triggering the Ottoman Interregnum.
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.
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.
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.
Hüma Hatun
Hüma Hatun (1410 ‒ September 1449) was the fourth wife of Ottoman Sultan Murad II and mother of Mehmed II and the grandmother of Bayezid II.
Mehmed I
Mehmed I (1379 – 26 May 1421), also known as Mehmed Çelebi ("the noble-born") or Kirişçi (from Greek "Kyritzeslord's son"), was the Ottoman Sultan from 1413 to 1421.
The fourth son of Sultan Bayezid I and Devlet Hatun, he fought with his brothers over control of the Ottoman realm in the Ottoman Interregnum (1402–1413).
Starting from the province of Rûm he managed to bring first Anatolia
and then the European territories (Rumelia)
under his control, reuniting the Ottoman state by 1413, and ruling it until his death in 1421.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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.

Question: Who is Mehmed I's paternal grandmother?
Answer: Gülçiçek Hatun