Isabella of Savoy
Isabella of Savoy (11 March 1591 – 28 August 1626) was a daughter of Charles Emmanuel I, Duke of Savoy, and Catherine Michelle of Spain.
Her maternal grandparents were Philip II of Spain and Elisabeth of Valois, her paternal grandparents were Emmanuel Philibert, Duke of Savoy and Margaret of France, Duchess of Berry.
She was the Hereditary Princess of Modena, dying before her husband succeeded to the Duchy of Modena in 1628.
Eldon Howard
Eldon Howard was a British screenwriter.
She was the mother- in- law of Edward J. Danziger and wrote a number of the screenplays for films by his company Danziger Productions.
Maria Thins
Maria Thins( c. 1593 – 27 December 1680) was the mother- in- law of Johannes Vermeer and a member of the Gouda Thins family.
Marian Shields Robinson
Marian Lois Robinson( née Shields; born July 29, 1937) is the mother of Michelle Obama, former First Lady of the United States, and Craig Robinson, a basketball executive, and the mother- in- law of former U.S. President Barack Obama.
Philibert I, Duke of Savoy
Philibert I (17 August 1465, Chambéry – 22 September 1482), surnamed the Hunter, was the son of Amadeus IX, Duke of Savoy and Yolande of Valois.
Philibert was Duke of Savoy from 1472 to 1482.
After his father's death in 1472, his mother became regent.
He married in 1476 to his cousin Bianca Maria Sforza and had no children.
Therefore, his duchy was inherited by his younger brother Charles after he died from tuberculosis at the age of just 17.
Prince Eugenio, Duke of Genoa
Prince Eugenio of Savoy, 5th Duke of Genoa( Eugenio Alfonso Carlo
Maria Giuseppe; 13 March 1906 – 8 December 1996) was a member of the House of Savoy, Duke of Ancona from birth, and the 5th and final Duke of Genoa.
Prince Eugenio was the sixth and youngest child of Prince Thomas of Savoy, 2nd Duke of Genoa and his wife Princess Isabella of Bavaria.
Priscilla Pointer
Priscilla Marie Pointer( born May 18, 1924) is an American stage, film and television character actress.
She began her career in the theater, including productions on Broadway.
Later, Pointer moved to Hollywood to act in films and on television.
She is the mother of Amy Irving, therefore making her the former mother- in- law of filmmakers Steven Spielberg and Bruno Barreto and the mother- in- law of documentary filmmaker Kenneth Bowser, Jr.
André Provana de Leyni
André or Andrea II Provana de Leyni( 1511, Leinì, Piedmont- 29 May 1592, Nice) was a statesman and military commander in the Duchy of Savoy.
He was captain- general of the duke of Savoy's galleys and councillor and diplomat in the service of Emmanuel Philibert, Duke of Savoy and his son Charles Emmanuel I, Duke of Savoy.
He was one of the most important figures in the restoration of the States of Savoy in the 16th century after its occupation by Francis I of France.
He bore the titles of lord of Leyni, count of Frossasco, Alpignano, Castellata and Balangero, knight of the Supreme Order of the Most Holy Annunciation and grand- admiral of the Order of Saint Maurice and Saint Lazarus.
Yolande Louise of Savoy
Yolande Louise of Savoy( 1487–1499), was a Duchess Consort of Savoy; married to Philibert II, Duke of Savoy.
Bianca Maria Sforza
Bianca Maria Sforza (5 April 1472 – 31 December 1510) was a Queen of the Romans and Holy Roman Empress as the third spouse of Maximilian I, Holy Roman Emperor.
She was the eldest legitimate daughter of Galeazzo Maria Sforza, Duke of Milan, by his second wife, Bona of Savoy.

Question: Who is Philibert I, Duke Of Savoy's mother-in-law?
Answer: Bona of Savoy