Tancred Ibsen
Tancred Ibsen (11 July 1893 – 4 December 1978) was a Norwegian officer, pilot, film director, and screenwriter.
He was the son of Sigurd Ibsen, and the grandson of Henrik Ibsen and Bjørnstjerne Bjørnson.
He was married to dancer and actress Lillebil Ibsen.
His son Tancred Ibsen, Jr. (1921–2015) was a Norwegian diplomat.
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.
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
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
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.
Joen Bille
Joen Steensen Bille( born 11 April 1944 in Frederiksberg) is a Danish actor.
He is a member of the noble Bille family, and is also a great- grandson of Henrik Ibsen and Bjørnstjerne Bjørnson.
He is the son of Irene Ibsen and grandson of Norwegian Prime Minister Sigurd Ibsen.
He is married to art historian Bente Scavenius and is the father of actress Beate Bille.
Joen Bille has been a theatre actor in Denmark since the early 1970s, and has had roles in a number of TV series.
Bente Scavenius
Bente Christina Brønnum Scavenius( born 12 December 1944, in Stockholm) is a Danish art historian, art critic and author.
She has taught at the University of Copenhagen and Aarhus University, and has written more than 20 books.
She has also been a member of numerous public and private committees and boards of directors of cultural institutions in Denmark.
She is the daughter of land owner Carl Christian Brønnum Scavenius, who owned Klintholm Gods, and a relative of former Prime Minister Erik Scavenius.
She is married to actor Joen Bille( of the noble Bille family), who is a son of Irene Ibsen Bille and a descendant of Henrik Ibsen, Sigurd Ibsen and Bjørnstjerne Bjørnson.
She is the mother of actress Beate Bille.
Scavenius has a mag. art. degree in history of art.
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.
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.
Irene Ibsen Bille
Irene Ibsen Bille (10 September 1901 – 22 February 1985) (née Irene Ibsen) was a Norwegian novelist and playwright.
She was born in Kristiania as a daughter of Prime Minister Sigurd Ibsen.
She was a sister of Tancred Ibsen, paternal granddaughter of world-famous writer Henrik Ibsen and Suzannah Ibsen (née Thoresen), daughter of Bergliot Ibsen (née Bjørnson) and maternal granddaughter of Bjørnstjerne Bjørnson and Karoline Bjørnson (née Reimers).
Irene Ibsen married Danish writer Steen Andersen Josias Christopher Bille (called Josias), a member of the ancient noble Bille family, in 1930, and moved to Denmark.
Her first dramatic work, "Uten ansikt" ('Faceless'), was published here.
"Kysset" ('The Kiss') followed in 1965.
In the same year she issued the novel "Det leende vindu" ('The Laughing Window').
She died in February 1985.

Question: Who is the sibling-in-law of Irene Ibsen Bille?
Answer: Lillebil Ibsen