Conrad I, Count of Oldenburg
Conrad I of Oldenburg (died 1347) was the Count of Oldenburg from 1344 to 1347.
He succeeded his brother, John III of Oldenburg.
He was the son of John II of Oldenburg and Hedwig of Diepholz.
Conrad married Ingeborg, the daughter of Count Gerhard IV of Holstein-Plön.
They had four children:
Conrad I of Oldenburg is also a male-line ancestor of Queen Margrethe II of Denmark, King Harald V of Norway, and of Philip, Duke of Edinburgh, and thus of Charles, Prince of Wales, and Prince William, Duke of Cambridge.
Anthony I, Count of Oldenburg
Anthony I, Count of Oldenburg and Delmenhorst( 1505 – 22 January 1573, Oldenburg) was a member of the House of Oldenburg and was the Imperial Count of the Counties of Oldenburg and Delmenhorst within the Holy Roman Empire of German Nation.
His parents were John V, Count of Oldenburg( 1460- 1525) and Anna of Anhalt- Zerbst.
John VII, Count of Oldenburg
Count John VII of Oldenburg and Delmenhorst( nicknamed" the Dike Builder"; 9 September 1540 in Oldenburg – 12 November 1603 in Oldenburg) was a member of the House of Oldenburg and was the ruling Count of County of Oldenburg from 1573 until his death.
His parents were Count Anthony I of Oldenburg and Sophie of Saxe- Lauenburg.
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.
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.
Ameli, Duchess of Oldenburg
Princess Ameli of Löwenstein-Wertheim-Freudenberg (4 March 1923 – 26 March 2016) was the daughter of Udo, Prince of Löwenstein-Wertheim-Freudenberg, and widow of Anton-Günther, Duke of Oldenburg, the late pretender to the Grand Duchy of Oldenburg who died on September 20, 2014.
Anton-Günther, Duke of Oldenburg
Anton-Günther, Duke of Oldenburg "(Anton-Günther Friedrich August Josias von Holstein-Gottorp, Erbgroßherzog von Oldenburg, Prinz von Lübeck, ;" 16 January 1923 – 20 September 2014) was the head of the Grand Ducal Family of Oldenburg.
He was born in Lensahn the son of Hereditary Grand Duke Nikolaus of Oldenburg (1897–1970) and his first wife Princess Helena of Waldeck and Pyrmont (1899–1948).
Duke Anton-Günther was a grandson of Frederick Augustus II, the last Grand Duke of Oldenburg, and through his mother a grandson of Friedrich, the last Prince of Waldeck and Pyrmont.
He studied for a Diplom in Forestry and succeeded as head of the Grand Ducal Family of Oldenburg upon the death of his father, the Hereditary Grand Duke, on 3 April 1970.
He died in September 2014 aged 91.
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.
Christian, Duke of Oldenburg
Christian, Duke of Oldenburg( born 1 February 1955) is the head of the Grand Ducal Family of Oldenburg.

Question: Who is the mother-in-law of Ameli, Duchess Of Oldenburg?
Answer: Princess Helena of Waldeck and Pyrmont