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.
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.
Charlotte d'Argenteau, comtesse d'Esneux
Charlotte d'Argenteau, Countess d'Esneux (18 October 167823 July 1710), a Belgian patrician heiress, was the beloved second wife of the English Jacobite exile Thomas Bruce, 2nd Earl of Ailesbury.
Vera Miletić
Vera Miletić (Serbian Cyrillic: Вера Милетић; 8 March 1920 – 7 September 1944) was a Serbian student and soldier.
She was notable for being the mother of Mira Marković, posthumously making her the mother-in-law of Serbian president Slobodan Milošević.
Cornelia (mother of the Gracchi)
Cornelia( c. 190s – c. 115 BC) was the second daughter of Publius Cornelius Scipio Africanus, the hero of the Second Punic War, and Aemilia Paulla.
She is remembered as a prototypical example of a virtuous Roman woman.
She was the mother of the Gracchi brothers, and the mother- in- law of Scipio Aemilianus.
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.
Baroness Gösta von dem Bussche-Haddenhausen
Baroness Gösta von dem Bussche- Haddenhausen( 26 January 1902 – 13 June 1996) was the mother of Prince Claus of the Netherlands, who was the Prince Consort of Queen Beatrix of the Netherlands, thus making her the mother- in- law of the former Dutch Queen.
She is also the paternal grandmother of King Willem- Alexander of the Netherlands, who is the current Dutch King.
Thomas Bruce, 2nd Earl of Ailesbury
Thomas Bruce, 2nd Earl of Ailesbury (later styled Aylesbury) and 3rd Earl of Elgin (1656 – 16 December 1741) was an English politician and memoirist.
He was the son of Robert Bruce, 2nd Earl of Elgin, and Lady Diana Grey.
His maternal grandparents were Henry Grey, 1st Earl of Stamford, and Lady Anne Cecil, daughter of William Cecil, 2nd Earl of Exeter.
His "Memoirs", which were not published until long after his death, are a valuable source for English history in the last quarter of the seventeenth century.
Marie, Princess of Hornes
Marie, Princess of Hornes( 30 November 1736), Baroness de Melsbroeck" suo jure", was the wife of Maximilian, Prince of Hornes.
She was born Lady Marie Thérèse Charlotte Bruce in Brussels in present- day Belgium, where her father, Thomas Bruce, 2nd Earl of Ailesbury and 3rd Earl of Elgin, had lived in exile since fleeing England in 1697 to avoid being tried for treason.
Her mother was Ailesbury's second wife, Charlotte d' Argenteau, comtesse d' Esneux.
On 17 June 1722 Marie Thérèse married the Sovereign Prince of Hornes: Maximilian Emanuel( 1695 – 1763), son of Philippe Emanuel, his predecessor, and Marie Anne Antoinette de Ligne.
They had two children, through whom she was the maternal grandmother of Princess Louise of Stolberg- Gedern, the unhappy wife of Jacobite pretender Charles Edward Stuart(" Bonnie Prince Charlie"), and Princess Amalie Zephyrine of Salm- Kyrburg, among others.

Question: Who is the mother-in-law of Charlotte D'Argenteau, Comtesse D'Esneux?
Answer: Diana Grey