Albert Visetti
Albert Anthony Visetti( 13 May 1846–10 July 1928) was a Dalmatian musician who moved to London where he was Professor of Singing at the Royal College of Music, becoming a Fellow in 1921.
He was the stepfather of the novelist Radclyffe Hall.
Morris Harvey
Morris Harvey( 1877– 1944) was a British actor and writer.
A renowned character actor, he also wrote for the stage, including material for Broadway revues, in which he also appeared.
He was the stepfather of film director Anthony Harvey.
Lolo Soetoro
Lolo Soetoro
( EYD: Lolo Sutoro;; 2 January 1935 – 2 March 1987), also known as Lolo Soetoro Mangunharjo or Mangundikardjo, of Indonesia was the stepfather of Barack Obama, the 44th President of the United States.
Albert E. Austin
Albert Elmer Austin( November 15, 1877 – January 26, 1942) was a Republican member of the United States House of Representatives from 1939 to 1941 and member of the Connecticut House of Representatives from 1917 to 1919 and from 1921 to 1923.
He was the stepfather of Clare Boothe Luce.
Alexander von Hanstein, Count of Pölzig and Beiersdorf
Maximilian Elisäus Alexander von Hanstein, Count of Pölzig and Beiersdorf( 9 June 1804, Burghaig, Kulmbach – 18 April 1884, Schmölln) was a Thuringian count.
He was the stepfather of Prince Albert and grandfather of Hans Poelzig.
Ishbel Hamilton-Gordon, Marchioness of Aberdeen and Temair
Ishbel Maria Hamilton-Gordon, Marchioness of Aberdeen and Temair, GBE ("née" Isabel Maria Marjoribanks; 15 March 1857 – 18 April 1939) was a British author, philanthropist, and an advocate of woman's interests.
As the wife of John Hamilton-Gordon, 1st Marquess of Aberdeen and Temair, she was viceregal consort of Canada from 1893 to 1898 and of Ireland from 1906-1915.
Marjorie Sinclair, Baroness Pentland
Marjorie Adeline Gordon Sinclair, Baroness Pentland DBE, DStJ (7 December 1880 – 26 July 1970) was the daughter of Sir John Campbell Hamilton-Gordon, 1st Marquess of Aberdeen and Temair and Ishbel Hamilton-Gordon, Marchioness of Aberdeen and Temair.
She was educated, mainly, by private tuition.
She accompanied her parents to Canada, on the appointment of her father as Governor-General, in 1893.
As a child, she founded and edited Wee Willie Winkie, a periodical for the young.
She was interested in Canadian history, and assisted her parents and took part in the "Tableaux Historiques" given by them in Montreal, Quebec the historical fancy dress ball given at Ottawa, Ontario and the Victorian Era ball given at Toronto, Ontario.
She was the first "May Queen" elected to preside over the May Court Club at Ottawa, which she helped found.
After returning to England, she wrote a dramatized version, in five acts, of Scott's "Fortunes of Nigel", and lectured.
Her coming out ball was held at Haddo House on 12 September 1899.
She made her debut in London society at a ball given by her parents in Grosvenor Street, June 1901.
She was presented at Court shortly thereafter.
In April 1903 her name was announced as a candidate for the School Board at Methlick, Aberdeenshire.
She married John Sinclair, 1st Baron Pentland (b. 7 July 1860 - d. 11 January 1925) on 12 July 1904; they had two children:
Travelling in India with her husband in 1914, she visited Travancore, where Beatrice A. Vieyra dedicated to her a cookbook, "Culinary Art Sparklets".
She was invested as a Dame Commander of the Order of the British Empire (DBE) in 1917.
She was also invested as a Dame of Grace, Order of St. John of Jerusalem
(D.G.St.J.).
She died on 26 July 1970, aged 89 from natural causes.
Jerrold Wexler
Jerrold Wexler( June 27, 1924 – November 10, 1992) was a noted American businessman and film producer.
He was the brother of cinematographer Haskell Wexler and the stepfather of actress Daryl Hannah.
Gerald Rudolff Ford
Gerald Rudolff Ford( December 9, 1890 – January 26, 1962) was an American businessman, creator of Ford Industries, and Republican politician who was the stepfather of U.S. President Gerald Ford and for whom Ford legally changed his name.
Héctor Barrantes
Héctor Barrantes Sansoni( 1939–1990) was an Argentine polo player.
He was the stepfather of Sarah, Duchess of York.

Question: Who is the father of Marjorie Sinclair, Baroness Pentland?
Answer: John Hamilton-Gordon, 1st Marquess of Aberdeen and Temair