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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Sophie Amalie Lindenov
Sophie Amalie Lindenov, Baroness of Lindenborg( 4 July 1649 – 4 August 1688) was a Danish noblewoman and landowner.
She was Baroness of Lindenborg and the owner of Lindenborg Castle.
Fred Le Deux
Frederick" Fred" Le Deux( born 4 December 1934) was an Australian rules footballer who played with Geelong in the Victorian Football League( VFL).
He is the grandfather of Tom Hawkins.
Marie Juliette Louvet
Marie Juliette Louvet( 9 May 1867 – 24 September 1930) was the lover of the then unmarried Prince Louis II of Monaco and was the mother of his only child, Princess Charlotte of Monaco.
Known as Juliette, Louvet was the daughter of Jacques Henri Louvet( 18301910) and his first wife, Joséphine Elmire Piedefer( 18281871).
She married the photographer Achille Delmaet, but they divorced in 1893.
They had two children, Georges and Marguerite.
Juliette Delmaet became an entertainer of sorts, reportedly a cabaret singer.
In 1897, she was a hostess in a Montmartre nightclub when she met Louis through her mother, who was the prince's laundress in Paris.
She gave birth to their daughter, Charlotte, in Constantine, Algeria, in 1898.
Through her daughter she is the maternal grandmother of Rainier III, Prince of Monaco and Princess Antoinette, Baroness of Massy.
Gisèle Pascal
Gisèle Pascal( 17 September 1921 – 2 February 2007) was a French actress and a former lover of Rainier III, Prince of Monaco.
She was born Gisèle Marie Madeleine Tallone at Cannes in France.
Her first movie role was in 1942's" L' Arlésienne".
For six years, she was involved in a relationship with Prince Rainier, and lived together in a villa in Saint- Jean- Cap- Ferrat.
Princess Antoinette, Baroness of Massy, Rainier's sister, seeking to obtain the throne of Monaco for her own son, spread malicious rumors that Pascal was incapable of bearing children.
A contemplated marriage was called off when a medical examination reported that she was infertile.
Pascal subsequently married actor Raymond Pellegrin on 8 October 1955 and had a daughter, Pascale Pellegrin, on 12 September 1962.
Jérôme Guedj
Jérôme Guedj( born 23 January 1972 in Pantin) is a French politician.
He is a Member of the Socialist Party, member of the sixth district of Essonne, President of the General Council of Essonne, General Councillor of the Canton of Massy- Est and alderman of Massy.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Henry Krause
Henry J." Red" Krause, Jr.( August 28, 1913 – February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.
He played college football at St. Louis University.
He is the grandfather of Jennifer Krause
He is the great grandfather of Payton Hoeing
Princess Antoinette, Baroness of Massy
Princess Antoinette of Monaco, Baroness of Massy
(Antoinette Louise Alberte Suzanne Grimaldi; 28 December 1920 – 18 March 2011) was a member of the princely family of Monaco and the elder sister of Prince Rainier III and aunt of Albert II, Prince of Monaco.
Her parents were Count Pierre de Polignac and Princess Charlotte, Duchess of Valentinois.
She was born in Paris of French and Monegasque ancestry.

Question: Who is the maternal grandfather of Princess Antoinette, Baroness Of Massy?
Answer: Louis II, Prince of Monaco