Charles Francis Norton
Charles Francis Norton( 1807 – 1835) was a 19th- century Member of Parliament for Guildford.
Norton was also a Captain of 52nd Light Infantry; son-in- law of Sir Colin Campbell; brother- in- law of writer Caroline Norton
Wyndham Goold
Wyndham Goold( 1812-1854) was a Member of Parliament( MP) for County Limerick from 1850 to 1854.
Goold was educated at Westminster School and Trinity College, Dublin.
He was the son in law of Frederick Falkiner Goold, Archdeacon of Raphoe and brother in law of Bishop Hamilton Verschoyle
Lee Chan-hyuk
Lee Chan- hyuk( born September 12, 1996), is a South Korean singer, songwriter and producer.
He debuted as a member of the sibling duo AKMU in April 2014, under YG Entertainment.
Nick Sidi
Nick Sidi( born 22 February 1966 in Manchester, England) is an English actor.
He is the son -in- law of actress Rosalind Knight and brother- in- law of actress Susannah Elliott- Knight.
He often plays drama or comedy roles on television and frequently appears in BBC dramas.
Robert W. Levering
Robert Woodrow Levering( October 3, 1914 – August 11, 1989) was a U.S. Representative from Ohio, son-in- law of Usher L. Burdick and brother- in- law of Quentin N. Burdick.
Robert Vadra
Robert Vadra is an Indian businessman, entrepreneur and the husband of Priyanka Gandhi.
He is the son -in- law of Sonia Gandhi and Rajiv Gandhi, and the brother- in- law of Rahul Gandhi.
Edith Ewing Bouvier Beale
Edith Ewing Bouvier Beale (October 5, 1895 – February 5, 1977) was an American socialite known for her reclusive and eccentric lifestyle.
Known as "Big Edie", she was a sister of John Vernou Bouvier III and an aunt of Jacqueline Kennedy Onassis.
Her life and relationship with her daughter Edith Bouvier Beale were highlighted in the 1975 documentary "Grey Gardens".
Romanos Argyros (10th century)
Romanos Argyros was a Byzantine aristocrat and son-in- law of Emperor Romanos I Lekapenos.
Greg Penner
Gregory B. Penner( born December 18, 1969) is an American businessman and venture capitalist.
Penner was named the chairman of Walmart on June 5, 2015.
He is the son-in- law of S. Robson Walton and the grandson- in- law of Sam Walton, the founder of Walmart.
Phelan Beale
Phelan Beale (May 23, 1881 – June 12, 1956) was an American attorney and sportsman in New York City who was married to Edith Ewing Bouvier, an aunt of Jacqueline Kennedy Onassis.
Beale is probably best remembered as the absent father chronicled in the Grey Gardens saga
portrayed in a 1975 movie documentary,
2006 Broadway musical, and 2009 HBO Film, all of which were named for his home in East Hampton, New York.

Question: Who is the sibling-in-law of Phelan Beale?
Answer: John Vernou Bouvier III