John Montgomery Glover
John Montgomery Glover( September 4, 1822 – November 15, 1891) was a North American politician, who served as a U.S. Representative from Missouri, he was the uncle of John Milton Glover.
Mark Twain
Samuel Langhorne Clemens (November 30, 1835 – April 21, 1910), known by his pen name Mark Twain, was an American writer, humorist, entrepreneur, publisher, and lecturer.
He was lauded as the "greatest humorist this country has produced", and William Faulkner called him "the father of American literature".
His novels include "The Adventures of Tom Sawyer" (1876) and its sequel, the "Adventures of Huckleberry Finn" (1884), the latter often called "The Great American Novel".
Twain was raised in Hannibal, Missouri, which later provided the setting for "Tom Sawyer" and "Huckleberry Finn".
He served an apprenticeship with a printer and then worked as a typesetter, contributing articles to the newspaper of his older brother Orion Clemens.
He later became a riverboat pilot on the Mississippi River before heading west to join Orion in Nevada.
He referred humorously to his lack of success at mining, turning to journalism for the Virginia City "Territorial Enterprise".
His humorous story, "The Celebrated Jumping Frog of Calaveras County", was published in 1865, based on a story that he heard at Angels Hotel in Angels Camp, California, where he had spent some time as a miner.
The short story brought international attention and was even translated into French.
His wit and satire, in prose and in speech, earned praise from critics and peers, and he was a friend to presidents, artists, industrialists, and European royalty.
Twain earned a great deal of money from his writings and lectures, but he invested in ventures that lost most of it—such as the Paige Compositor, a mechanical typesetter that failed because of its complexity and imprecision.
He filed for bankruptcy in the wake of these financial setbacks, but he eventually overcame his financial troubles with the help of Henry Huttleston Rogers.
He eventually paid all his creditors in full, even though his bankruptcy relieved him of having to do so.
Twain was born shortly after an appearance of Halley's Comet, and he predicted that he would "go out with it" as well; he died the day after the comet returned.
Giuseppe Bonizzoni
Giuseppe Bonizzoni( 22 April 1908 – 21 July 1976) was an Italian professional footballer who played as a defender.
He was the uncle of former footballer and manager Luigi Bonizzoni.
Susy Clemens
Olivia Susan "Susy" Clemens (March 19, 1872 – August 18, 1896), was the second child and oldest daughter of Samuel Clemens, who wrote under the pen name Mark Twain, and his wife Olivia Langdon Clemens.
She inspired some of her father's works, at 13 wrote her own biography of him, which he later published in his autobiography, and acted as a literary critic.
Her father was heartbroken when she died of spinal meningitis at age twenty-four.
Her biography of her father was published in 1988 in its entirety as "Papa: An Intimate Biography of Mark Twain", a volume which also included a biography of Susy Clemens and her correspondence with her father.
Christopher H. Clark
Christopher Henderson Clark (1767 – November 21, 1828) was a congressman and lawyer from Virginia.
He was the brother of James Clark, the uncle of John Bullock Clark, Sr. and the great-uncle of John Bullock Clark, Jr..
Hysen Hoxha
Hysen Efendi Hoxha( 1861–1934) was an Albanian politician, mayor of Gjirokastër, and the uncle of Enver Hoxha.
Tarcisio Fusco
Tarcisio Fusco was an Italian composer of film scores.
He was the brother of the composer Giovanni Fusco and the uncle of operatic soprano Cecilia Fusco.
Bradley Orr
Bradley James Orr( born 1 November 1982) is an English retired footballer.
He is the uncle of Rangers defender Jon Flanagan.
Ivan Novoseltsev
Ivan Petrovich Novoseltsev( born January 23, 1979) is a Russian former professional ice hockey winger.
He is the uncle of Vladislav Namestnikov.
Bonifazio Bevilacqua Aldobrandini
Bonifazio Bevilacqua Aldobrandini (1571 – April 7, 1627) was an Italian Cardinal.
He was the uncle of Pope Gregory XIV.

Question: Who is the uncle of Susy Clemens?
Answer: Orion Clemens