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.
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.
Doria Ragland
Doria L. Ragland( born September 2, 1956) is the mother of Meghan, Duchess of Sussex, the mother- in- law of Prince Harry, and the maternal grandmother of Archie Mountbatten- Windsor, who is seventh in line to the British throne.
She is a former makeup artist, business owner, yoga instructor, and former social worker who worked in the mental health sector from 2015 to 2018.
Margaret of Sicily
Margaret of Sicily( also called Margaret of Hohenstaufen or Margaret of Germany)( 1 December 1241, in Foggia – 8 August 1270, in Frankfurt- am- Main) was a Princess of Sicily and Germany, and a member of the House of Hohenstaufen.
By marriage she was Landgravine of Thuringia and Countess Palatine of Saxony( German:" Landgräfin von Thüringen und Pfalzgräfin von Sachsen").
She was the daughter of Frederick II, Holy Roman Emperor, King of Sicily and Germany, by his third wife, Isabella of England.
Her paternal grandparents were Henry VI, Holy Roman Emperor and Constance of Sicily.
Her maternal grandparents were John of England and Isabella of Angoulême.
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.
Rudolf II, Count Palatine of the Rhine
Rudolf II
"the blind" (8 August 1306 – 4 October 1353) was Count Palatine of the Rhine (see Palatinate) from 1329 to 1353.
He was born in Wolfratshausen, the son of Rudolf I, Duke of Bavaria, and Mechtild of Nassau, daughter of King Adolf of Nassau-Weilburg.
His uncle was Emperor Louis IV.
During his childhood, his father and his uncle fought over their inheritance.
After the death of his father, his family was placed under the guardianship of Duke Johann von Nassau, who was a partisan of the Austrian cause.
His uncle, Louis IV, Holy Roman Emperor had taken the Palatinate by force of arms.
In August 1322, the war finally came to an end, but only after Mechthild's death in June 1323, were the three nephews finally able to make peace with their uncle.
His sons inherited Bavaria and Rudolf
I's sons inherited the Upper Palatinate and the Palatinate in line with the Treaty of Pavia.
He was blind only in the last years of his life.
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.
Margaret of Sicily, Countess Palatine of the Rhine
Margaret of Sicily or Margherita di Sicilia-Aragona (1331 in Palermo – 1377 in Neustadt) was a Sicilian princess, daughter of the King Frederick III of Sicily and his wife Eleanor of Anjou.
In 1348 she married Rudolf II, Count Palatine of the Rhine, and was Countess Palatine of the Rhine until 1353, year of the husband's death.
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.

Question: Who is Margaret Of Sicily, Countess Palatine Of The Rhine's mother-in-law?
Answer: Mechtild of Nassau