Bharata (Mahabharata)
In Hindu scriptures, Bharata  is an ancestor of the Pandavas and the Kauravas in the Sanskrit epic Mahabharata.
Though the Bhāratas are a prominent community in the Rigveda, the story of Bharata is first told in the Adi Parva of the Mahabharata, wherein he is the son of Dushyanta and Shakuntala.
The story of his parents and his birth is also related in Kalidasa's famous play Abhijñānashākuntala.
Indradyumna
Indradyumna (Sanskrit: इन्द्रद्युम्न, IAST: Indradyumna), son of Bharata and Sunanda, was a Malava king, according to the Mahabharata and the Puranas.
Noted Indologist John Dowson has opined that there have been several kings of this name and the most prominent one being the "Indradyumna" who ruled over Avanti region and set up the icon of Lord Jagannath in Puri.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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.
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.
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.
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.
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 Indradyumna's paternal grandmother?
Answer: Shakuntala