Tushar Gandhi
Tushar Arun Gandhi( born 17 January 1960) is the son of journalist Arun Manilal Gandhi, grandson of Manilal Gandhi and great- grandson of Mahatma Gandhi.
In March 2005, he led the 75th anniversary re-enactment of the Dandi March.
From 2007 to 2012, he was the Goodwill Ambassador of the CISRI- ISP Intergovernmental Institution for the use of Micro- algae Spirulina Against Malnutrition.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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.
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.
Manilal Gandhi
Manilal Mohandas Gandhi (28 October 1892 – 5 April 1956) was the second son of Mohandas Gandhi and Kasturba Gandhi.
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.
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.
Arun Manilal Gandhi
Arun Manilal Gandhi (born 1934) is an Indian-American socio-political activist, and the fifth grandson of Mahatma Gandhi through his second son Manilal.
Although he has followed in the footsteps of his grandfather as an activist, he has eschewed the ascetic lifestyle of his grandfather.
In 2017 he published "The Gift of Anger:
And Other Lessons From My Grandfather Mahatma Gandhi" (New York: Gallery Books/Jeter Publishing 2017).

Question: Who is Arun Manilal Gandhi's paternal grandmother?
Answer: Kasturba Gandhi