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.
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.
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.
Elizabeth Trubetskaya
Elizabeth Trubetskaya( 1834- 1907), was a Russian Princess and salonist, by birth member of Belosselsky- Belozersky family.
She hosted a famous literary salon in Paris during the Second Empire, and played a crucial part as a mediator when France and Russia established their diplomatic contacts in the 1870s.
She was grandmother of Princess Aurora Pavlovna Demidova di San Donato, great- grandmother of Prince Regent Paul of Yugoslavia and thus ancestor of Prince Alexander of Yugoslavia, Princess Elizabeth of Yugoslavia and actress Catherine Oxenberg.
Prince Nikita Alexandrovich of Russia
Prince Nikita Alexandrovich of Russia (13 January 1900 – 12 September 1974) was the third son and fourth child of Grand Duke Alexander Mikhailovich of Russia and Grand Duchess Xenia Alexandrovna of Russia.
He was a nephew of Tsar Nicholas II of Russia.
Born in Imperial Russia during the reign of his uncle, Prince Nikita escaped the fate of many of his relatives who were killed by the Bolsheviks.
He left Russia in April 1919, at age nineteen.
In 1922 he married Countess Maria Vorontsova-Dashkova.
The couple had two children.
Prince Alexander Romanov
Prince Alexander Nikitich Romanov (4 November 1929 – 22 September 2002) was a member of the Romanov family.
He was a son of Prince Nikita Alexandrovich of Russia and a great nephew of Nicholas II of Russia, the last Tsar.
Born in France, he took British citizenship in 1938 and lived with his grand mother Grand Duchess Xenia Alexandrovna in England until her death in 1960.
The following year, Prince Alexander Nikitich became the first member of the Romanov family to visit Russia after the Revolution.
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.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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 paternal grandmother of Prince Alexander Romanov?
Answer: Grand Duchess Xenia Alexandrovna of Russia