Claudine, Lady of Monaco
Claudine or Claudia( – 19 November 1515) was Lady regnant of Monaco between 1457 and 1458, and the Lady consort of Monaco by marriage to Lord Lambert of Monaco.
Caroline, Princess of Hanover
Caroline, Princess of Hanover( Caroline Louise Marguerite Grimaldi; born 23 January 1957), is the eldest child of Rainier III, Prince of Monaco, and the American actress Grace Kelly.
She is the elder sister of Prince Albert II and Princess Stéphanie.
Until the births of her niece and nephew, Princess Gabriella and Prince Jacques, in December 2014, she had been heiress presumptive to the throne of Monaco since 2005, a position which she previously held from 1957 to 1958.
Caroline is married to Ernst August, Prince of Hanover( born 1954), the heir to the defunct throne of the former Kingdom of Hanover, as well as the heir male of George III of the United Kingdom.
Princess Charlotte, Duchess of Valentinois
Princess Charlotte of Monaco, Duchess of Valentinois( Charlotte Louise Juliette Grimaldi; 30 September 1898 – 15 November 1977), was the daughter of Louis II, Prince of Monaco, and the mother of Rainier III, Prince of Monaco.
From 1922 until 1944, she was the Hereditary Princess of Monaco, heir presumptive to the throne.
Princess Gabriella, Countess of Carladès
Princess Gabriella of Monaco, Countess of Carladès( Gabriella Thérèse Marie Grimaldi; born 10 December 2014), is the daughter of Prince Albert II and Princess Charlene.
She is second in the line of succession to the Monegasque throne, behind her twin brother, Hereditary Prince Jacques.
Jacques, Hereditary Prince of Monaco
Jacques, Hereditary Prince of Monaco, Marquis of Baux (Jacques Honoré Rainier Grimaldi; born 10 December 2014), is the heir apparent to the Monegasque throne.
He is the son of Prince Albert II and Princess Charlene and twin brother of Princess Gabriella.
Robert Calcagno
Robert Calcagno born 26 June 1960 is a Monegasque politician and leader who is CEO of the Oceanographic Institute
Foundation Albert I, Prince of Monaco.
Robert Calcagno has held ministerial posts in the government of the Principality of Monaco between 2006 and 2009.
He now leads the Oceanographic Museum of Monaco and the Maison des océans in Paris
His commitment to the protection of the oceans, to a better balance between Humankind and Nature and, on a broader level, his involvement in the economic, social and international life of the Principality of Monaco, have made him one of the key players in the policies of H.S.H. Prince Albert II of Monaco.
Albert II, Prince of Monaco
Albert II (Albert Alexandre Louis Pierre Grimaldi; born 14 March 1958) is the reigning monarch of the Principality of Monaco and head of the princely house of Grimaldi.
He is the son of Prince Rainier III and Grace, Princess of Monaco formerly Grace Kelly, the American actress.
Prince Albert's sisters are Caroline, Princess of Hanover, and Princess Stéphanie.
In July 2011, Prince Albert married Charlene Wittstock.
Prince Albert II is one of the wealthiest royals in the world, with assets valued at more than $1 billion, which include land in Monaco and France.
Although Prince Albert does not own the Prince's Palace of Monaco, he does own shares in the "Société des bains de mer de Monaco", which operates Monaco's casino and other entertainment properties in the principality.
Prince Jacques, Duke of Orléans
Prince Jacques of Orléans, Duke of Orléans," fils de France"( Jacques Jean Jaroslaw Marie; born 25 June 1941 in Rabat, Morocco), is the son of Henri, Count of Paris( the Orléanist claimant to the French throne from 1940 until his death) and his wife, Princess Isabelle of Orléans- Braganza.
Pomellina Fregoso
Pomellina Fregoso( 1387/88 in Genoa – 1468 in Monaco) was Lady Consort of Monaco by marriage to Jean I, Lord of Monaco, and the mother of Lord Catalan.
She served as regent of Monaco several times during the absence of her husband, as well as between 1457 and March 1458, as the guardian of her granddaughter Claudine, Lady of Monaco.
She was thus the first woman to rule Monaco.
Honoré III, Prince of Monaco
Honoré III( 10 November 1720 – 21 March 1795) ruled as Prince of Monaco and was Duke of Valentinois from 1731 to 1793.
Honoré was the son of Louise Hippolyte, Princess of Monaco, and her husband, Prince Jacques I.

Question: Who is Jacques, Hereditary Prince Of Monaco's paternal grandfather?
Answer: Rainier III