Hortense de Beauharnais
Hortense Eugénie Cécile Bonaparte (French pronunciation: [ɔʁtɑ̃s øʒeni sesil bɔnɑpaʁt]; née de Beauharnais, pronounced [də boaʁnɛ]; 10 April 1783 – 5 October 1837), Queen consort of Holland, was the stepdaughter of Emperor Napoléon I, being the daughter of his first wife, Joséphine de Beauharnais and the younger sister of Eugène de Beauharnais.
She later married Napoléon
I’s brother, Louis Bonaparte, King of Holland, making her the sister-in-law to her step-father.
She was the mother of Napoléon III, Emperor of the French, Louis II of Holland, and Napoléon Louis Charles Bonaparte who died at the age of four.
She had also an illegitimate son, The 1st Duc de Morny, by her lover, the Comte de Flahaut.
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.
Bonifazio Bevilacqua Aldobrandini
Bonifazio Bevilacqua Aldobrandini (1571 – April 7, 1627) was an Italian Cardinal.
He was the uncle of Pope Gregory XIV.
Ivan Novoseltsev
Ivan Petrovich Novoseltsev( born January 23, 1979) is a Russian former professional ice hockey winger.
He is the uncle of Vladislav Namestnikov.
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..
William Bonaparte-Wyse
Captain William Charles Bonaparte- Wyse( 20 January 1826 – 3 December 1892) was an Irish soldier and poet.
Napoléon Charles Bonaparte
Napoléon Louis Charles Bonaparte (10 October 1802 – 5 May 1807) was the eldest son of Louis Bonaparte and Hortense de Beauharnais.
His father was Emperor Napoleon
I's younger brother; his mother was the daughter of Napoleon's first wife, Josephine de Beauharnais.
Hysen Hoxha
Hysen Efendi Hoxha( 1861–1934) was an Albanian politician, mayor of Gjirokastër, and the uncle of Enver Hoxha.
Bradley Orr
Bradley James Orr( born 1 November 1982) is an English retired footballer.
He is the uncle of Rangers defender Jon Flanagan.
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.

Question: Who is Napoléon Charles Bonaparte's uncle?
Answer: Eugène de Beauharnais