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.
Poom Jensen
Khun Poom Jensen (16 August 1983 – 26 December 2004), born Bhumi Jensen (also spelled Poomi Jensen), was a grandson of King Bhumibol Adulyadej of Thailand, after whom he was named.
He was also a nephew of Vajiralongkorn, the current King of Thailand.
He was the son of the King's eldest daughter, Princess Ubolratana Rajakanya, and her American (former) husband Peter Ladd Jensen.
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.
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.
Ubol Ratana
Princess Ubol Ratana (born 5 April 1951) is a member of the Thai royal family.
She is the eldest child of King Bhumibol Adulyadej and Queen Sirikit.
In 1972, she married American citizen Peter Ladd Jensen and settled in the United States, losing her royal title in the process.
The couple divorced in 1998
whereupon she resumed her royal duties and position within the Thai court.
She is styled in English as "Princess Ubol Ratana", without the style "Her Royal Highness".
In 2001, she permanently returned to Thailand after a series of visits in the years following her divorce.
Almost immediately, she began to fulfill her royal duties by taking part in many ceremonies.
She started many charitable foundations that focused on improving the quality of life for the disadvantaged.
In February 2019, in an "unprecedented" move, Ubol Ratana announced her candidacy for Prime Minister of Thailand in the 2019 general election, running as a candidate of the Thaksin-allied Thai Raksa Chart Party.
Later that same day, her younger brother King Vajiralongkorn issued an emergency royal decree stating that her candidacy is "inappropriate" and "unconstitutional".
Thailand’s election commission then disqualified her from running for prime minister, formally putting an end to her candidacy.
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.
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.
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.

Question: Who is the maternal grandmother of Poom Jensen?
Answer: Sirikit