Eusebius (consul 359)
Flavius Eusebius( died after AD 371) was a Roman Senator, who was the brother- in- law of the emperor Constantius II.
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.
Giulia Grisi
Giulia Grisi (22 May 1811 – 29 November 1869) was an Italian opera singer.
She performed widely in Europe, the United States and South America and is widely considered to be one of the leading sopranos of the 19th century.
Her second husband was Giovanni Matteo Mario de Candia (also known as "Mario the Tenor"), scion of a noble family of the Kingdom of Sardinia.
She is buried at Père Lachaise Cemetery in Paris.
Her grave is marked "Juliette de Candia", styled in her married last name.
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
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.
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
Giuditta Grisi
Giuditta Grisi (28 July 1805 – 1 May 1840) was an Italian operatic mezzo-soprano, sister of soprano Giulia Grisi and cousin of ballerina Carlotta Grisi.
She was born and studied in Milan, and made her debut in Vienna, as Faliero in "Bianca e Faliero", in 1826.
She specialized in Rossini roles, which from 1827, she sang throughout Italy, also creating several roles in opera by composers such as Persiani, Coccia, Pacini, etc.
Bellini wrote the role of Romeo in "I Capuleti e i Montecchi" for her in 1830.
She appeared in London, and at the Théâtre-Italien in Paris, singing Romeo, "La stranieraLa donna del lago", etc.
Superbly gifted, she suffered early from serious vocal problems, which necessitated considerable transposition and rewriting of the vocal line.
She died prematurely aged only 34, at Lodi, Lombardy.
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.
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.
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.

Question: Who is the sibling-in-law of Giuditta Grisi?
Answer: Giovanni Matteo Mario