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.
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
Aino Sibelius
Aino Sibelius (née Järnefelt; 10 August 1871 – 8 June 1969) was the wife of Finnish composer Jean Sibelius.
They lived most of their 65 years of married life at their home Ainola near Lake Tuusula, Järvenpää, Finland.
They had six daughters: Eva (1893–1978), Ruth (1894–1976), Kirsti (1898–1900), Katarina (1903–1984), Margareta (1908–1988) and Heidi (1911–1982).
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.
Hypatius (consul 359)
Flavius Hypatius( c. 340- died after AD 383) was a Roman Senator, who was the brother- in- law of the Roman emperor Constantius II.
Eusebius (consul 359)
Flavius Eusebius( died after AD 371) was a Roman Senator, who was the brother- in- law of the emperor Constantius II.
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.
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.
Jean Sibelius
Jean Sibelius , born Johan Julius Christian Sibelius (8 December 186520 September 1957), was a Finnish composer and violinist of the late Romantic and early-modern periods.
He is widely recognized as his country's greatest composer and, through his music, is often credited with having helped Finland to develop a national identity during its struggle for independence from Russia.
The core of his oeuvre is his set of seven symphonies, which, like his other major works, are regularly performed and recorded in his home country and internationally.
His other best-known compositions are "Finlandia", the "Karelia SuiteValse triste", the Violin Concerto, the choral symphony "Kullervo", and "The Swan of Tuonela" (from the "Lemminkäinen Suite").
Other works include pieces inspired by nature, Nordic mythology, and the Finnish national epic, the "Kalevala", over a hundred songs for voice and piano, incidental music for numerous plays, the opera "Jungfrun
i tornetThe Maiden in the Tower"), chamber music, piano music, Masonic ritual music, and 21 publications of choral music.
Sibelius composed prolifically until the mid-1920s, but after completing his Seventh Symphony (1924), the incidental music for "The Tempest" (1926) and the tone poem "Tapiola" (1926), he stopped producing major works in his last thirty years, a stunning and perplexing decline commonly referred to as "The Silence of Järvenpää", the location of his home.
Although he is reputed to have stopped composing, he attempted to continue writing, including abortive efforts on an eighth symphony.
In later life, he wrote Masonic music and re-edited some earlier works while retaining an active but not always favourable interest in new developments in music.
The Finnish 100 mark note featured his image until 2002, when the euro was adopted.
Since 2011, Finland has celebrated a Flag Day on 8 December, the composer's birthday, also known as the "Day of Finnish Music".
In 2015, the 150th anniversary of the composer's birth, a number of special concerts and events were held, especially in the city of Helsinki.

Question: Who is Aino Sibelius's sibling-in-law?
Answer: Christian Sibelius