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.
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.
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.
Lady Augusta Murray
Lady Augusta De Ameland ("née" Murray; 27 January 1768 – 5 March 1830) was a mistress of Prince Augustus Frederick, Duke of Sussex, the sixth son of George III.
Although they married, their union was in contravention of the Royal Marriages Act 1772 and as such was considered legally void.
As a result she could not be styled as the Duchess of Sussex or be referred to as a Royal Highness.
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.
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.
Prince Augustus Frederick, Duke of Sussex
Prince Augustus Frederick, Duke of Sussex, (27 January 1773 – 21 April 1843) was the sixth son and ninth child of King George III and his queen consort, Charlotte of Mecklenburg-Strelitz.
He was the only surviving son of George III who did not pursue an army or navy career.
He was known for his liberal views, which included reform of Parliament, abolition of the slave trade, Catholic emancipation, and the removal of existing civil restrictions on Jews and dissenters.
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.
Augusta Emma Wilde, Baroness Truro
Augusta Emma Wilde, Baroness Truro( née d' Este; 11 August 1801 – 21 May 1866) was the daughter of Prince Augustus Frederick( sixth son of King George III), later Duke of Sussex, by his marriage with Lady Augusta Murray, second daughter of John Murray, 4th Earl of Dunmore, and Lady Charlotte Stewart.

Question: Who is Lady Augusta Murray's mother-in-law?
Answer: Charlotte of Mecklenburg-Strelitz