Grand Duchess Elena Pavlovna of Russia
Grand Duchess Elena Pavlovna of Russia, Hereditary Grand Duchess of Mecklenburg( 24 December 1784[ OS 13 December] – 24 September 1803) was a daughter of Grand Duke, later Tsar Paul I of Russia and his second wife Sophie Dorothea of Württemberg.
After marrying the son and heir of the Grand Duke of Mecklenburg- Schwerin she ceased to use her Russian title.
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Princess Elizabeth of Greece and Denmark
Princess Elisabeth of Greece and Denmark( 24 May 1904 – 11 January 1955) was the middle daughter of Prince Nicholas of Greece and Grand Duchess Elena Vladimirovna of Russia.
Grand Duchess Elena Vladimirovna of Russia
Grand Duchess Elena Vladimirovna of Russia (17 January 1882 – 13 March 1957), sometimes known as Helen, Helena, Helene, Ellen, Yelena, Hélène, or Eleni, was a Russian grand duchess as the only daughter and youngest child of Grand Duke Vladimir Alexandrovich of Russia and Duchess Marie of Mecklenburg-Schwerin.
Her husband was Prince Nicholas of Greece and Denmark
and they were both first cousins of Emperor Nicholas II of Russia.
Grand Duke Vladimir Alexandrovich of Russia
Grand Duke Vladimir Alexandrovich of Russia (22 April 1847 – 17 February 1909) was a son of Emperor Alexander II of Russia, a brother of Emperor Alexander III of Russia and the senior Grand Duke of the House of Romanov during the reign of his nephew, Emperor Nicholas II.
Grand Duke Vladimir followed a military career and occupied important military positions during the reigns of the last three Russian Emperors.
Interested in artistic and intellectual pursuits; he was appointed President of the Academy of Fine Arts.
He functioned as a patron of many artists and as a sponsor of the Imperial ballet.
During the reign of his father, Emperor Alexander II, he was made Adjutant-General, senator in 1868 and a member of the Council of State in 1872.
His brother, Alexander III, also promoted his career.
He became a member of the Council of Ministers, Commander of the Imperial Guards Corps and Military Governor of Saint Petersburg.
He tried to exert some influence over his nephew Tsar Nicholas II, but had to content himself with holding a rival court with his wife Grand Duchess Maria Pavlovna at his palace in Saint Petersburg.
The events of Bloody Sunday in 1905, while he was Military Governor of St Petersburg, tarnished his reputation.
During the last years of his life, the rift between his family and that of Nicholas II widened.
He died after a stroke in 1909.
Grand Duchess Olga Pavlovna of Russia
Grand Duchess Olga Pavlovna of Russia  was a "Grand Duchess of Russia" as the second youngest daughter and seventh child of Emperor Paul I of Russia and his empress consort, Sophie Dorothea of Württemberg.
Grand Duchess Maria Vladimirovna of Russia
Grand Duchess Maria Vladimirovna of Russia (born 23 December 1953 in Madrid) has been a claimant to the headship of the Imperial Family of Russia (who reigned as Emperors and Autocrats of All the Russias from 1613 to 1917) since 1992.
Although she has used Grand Duchess of Russia as her title of pretence with the style Imperial Highness throughout her life, her right to do so is disputed.
She is a great-great-granddaughter in the male line of Emperor Alexander II of Russia.
Grand Duke Nicholas Konstantinovich of Russia
Grand Duke Nicholas Constantinovich of Russia( 14 February 1850 – 26 January 1918) was the first- born son of Grand Duke Konstantin Nikolayevich and Grand Duchess Alexandra Iosifovna of Russia and a grandson of Nicholas I of Russia.
Princess Charlotte of Württemberg
Princess Charlotte of Württemberg (9 January 1807 – 2 February 1873) was later known as Grand Duchess Elena Pavlovna, the wife of Grand Duke Michael Pavlovich of Russia.
He was the youngest son of Emperor Paul I of Russia and Duchess Sophie Dorothea of Württemberg.
Prince Dmitri Alexandrovich of Russia
Prince Dmitri Alexandrovich of Russia( 15 August 1901 – 7 July 1980) was the fourth son and fifth 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.

Question: Who is the paternal grandfather of Grand Duchess Elena Vladimirovna Of Russia?
Answer: Alexander II of Russia