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.
Héctor Barrantes
Héctor Barrantes Sansoni( 1939–1990) was an Argentine polo player.
He was the stepfather of Sarah, Duchess of York.
Charles Williams, Baron Williams of Elvel
Charles Cuthbert Powell Williams, Baron Williams of Elvel,( born 9 February 1933) is a retired business executive and a Labour peer.
In his 20s he played first- class cricket while at university and for several seasons afterwards.
He is the stepfather of Justin Welby, the Archbishop of Canterbury.
Günther von Reibnitz
"Freiherr" Günther Hubertus von Reibnitz (8 September 1894 – 2 March 1983) was a cavalry officer of the German Empire during the First World War.
He joined the Nazi Party in 1930 and was a member of the SS Cavalry Corps.
Reibnitz married four times and was the father of Princess Michael of Kent.
Two of his grandchildren, Lord Frederick Windsor and Lady Gabriella Windsor, are in the line of succession to the British throne.
Lady Gabriella Kingston
Lady Gabriella Marina Alexandra Ophelia Kingston ("née" Windsor; born 23 April 1981) is an English freelance writer and a member of the extended British royal family.
She is the daughter of Prince and Princess Michael of Kent.
She is 52nd in line to the succession of the British throne.
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.
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.
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.
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.
Princess Michael of Kent
Princess Michael of Kent (born Baroness Marie Christine von Reibnitz; 15 January 1945) is a member of the British royal family of German, Austrian and Hungarian descent.
She is married to Prince Michael of Kent, a grandson of
King George V. Princess Michael was an interior designer before becoming an author; she has written several books on European royalty.
She does lecture tours as well as supporting her husband in his public duties.

Question: Who is Lady Gabriella Kingston's father?
Answer: Prince Michael of Kent