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.
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.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Lucilla
Annia Aurelia Galeria Lucilla or Lucilla (March 7, 148 or 150 – 182) was the second daughter and third child of Roman Emperor Marcus Aurelius and Roman Empress Faustina the Younger.
She was the wife of her father's co-ruler Lucius Verus and an elder sister to later Emperor Commodus.
Commodus ordered Lucilla's execution after a failed assassination and coup attempt when she was about 33 years old.
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.
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.
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.
Faustina the Younger
Annia Galeria Faustina Minor ("Minor" is Latin for "the Younger"), Faustina Minor or Faustina the Younger (born probably 21 September CE, — 175/176 CE)
was a daughter of Roman Emperor Antoninus Pius and Roman Empress Faustina the Elder.
She was a Roman Empress and wife to her maternal cousin Roman Emperor Marcus Aurelius.
She was held in high esteem by soldiers and her own husband and was given divine honours after her death.

Question: Who is the maternal grandmother of Lucilla?