Robert W. Levering
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Charles Francis Norton
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Norton was also a Captain of 52nd Light Infantry; son-in- law of Sir Colin Campbell; brother- in- law of writer Caroline Norton
Nick Sidi
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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.
Franz Danzi
Franz Ignaz Danzi (June 15, 1763April 13, 1826) was a German cellist, composer and conductor, the son of the Italian cellist Innocenz Danzi (1730–98), and brother of the noted singer Franzeska Danzi.
Born in Schwetzingen, Franz Danzi worked in Mannheim, Munich, Stuttgart and Karlsruhe, where he died.
Danzi lived at a significant time in the history of European concert music.
His career, spanning the transition from the late Classical to the early Romantic styles, coincided with the origin of much of the music that lives in our concert halls and is familiar to contemporary classical-music audiences.
As a young man he knew Wolfgang Amadeus Mozart, whom he revered; he was a contemporary of Ludwig van Beethoven, about whom he—like many of his generation—had strong but mixed feelings; and he was a mentor for the young Carl Maria von Weber, whose music he respected and promoted.
Born in Schwetzingen and raised in Mannheim, Danzi studied with his father and with Georg Joseph Vogler before he joined the superlative orchestra of the Elector Karl Theodor in 1778 as a teenager.
In 1780 the first of his woodwind compositions was published at Mannheim.
His father, principal cellist of the orchestra, was praised by Mozart for his playing at the premiere of "Idomeneo".
Danzi remained behind in a Mannheim that was rendered more provincial when Karl Theodor moved his court to Munich in 1778.
After an apprenticeship with the small theater orchestra left in Mannheim, he rejoined the main court in Munich as principal cellist—taking his father's position—in 1784.
In 1790 he married the singer Maria Margarethe Marchand, with whom he travelled in an opera troupe to Leipzig, Prague, Venice, and Florence.
By 1798, once more in Munich, he rose to the position of assistant Kapellmeister in one of the most important musical centers of Europe, but in 1807, unhappy at the treatment he received at court and despairing of any further advancement, he left Munich to be Kapellmeister in the smaller and less important Stuttgart court of the new king of Württemberg, Frederick I.
After five years he moved again to Karlsruhe, where he spent the last years of his life at the Royal Konservatorium struggling to raise the modest courtly musical establishment to respectability.
Although not himself a composer of the first rank, Danzi was a highly competent musician.
At best, his music is charming, tuneful, and well crafted.
He is known today chiefly for his woodwind quintets, in which he took justifiable pride for the idiomatic treatment of the individual instruments.
He composed in most major genres of the time, including opera, church music, orchestral works, and many varieties of chamber music.
He was a first-rate cellist as well as a conscientious and—by all reports—effective orchestra leader and conductor.
Francesca Lebrun (1756–91), a singer and composer, was Franz Danzi's sister.
At Schwetzingen, the city concert hall was renamed in his honor in 2005.
Greg Penner
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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.
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He is the son -in- law of Sonia Gandhi and Rajiv Gandhi, and the brother- in- law of Rahul Gandhi.
Romanos Argyros (10th century)
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Wyndham Goold
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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
Margarethe Carl
Margarethe Carl was the stage name of Margarethe Bernbrunn( 10 September 1788 – 16 July 1861), a German soprano and actress.
Margarethe Danzi
Maria Margarethe Danzi "née" Marchand (1768 – 11 June 1800) was a German composer and soprano.
Margarethe Marchand was born in Germany.
Some sources give her birthplace as Munich and others Mannheim, and it was possible that the family was on tour in Frankfurt on the date of her birth.
She was the daughter of the singer, actress and dancer Magdalena Brochard Marchand and Theobald Hilary Marchand, director of the National Theatre of Mannheim.
Margarethe studied music and composition in Munich with Franziska Lebrun and in Salzburg with Leopold Mozart.
She apprenticed in supporting roles and debuted in 1787 at the age of 12 at the Mannheim Court Theater, performing the title role in 'The Youth' by Johann Jakob Engel.
In 1790 she married conductor and composer Franz Danzi, and performed with him as prima donna of the troupe Domenico Guardasonis on European concert tours.
After 1796 Margaret also performed as prima donna at the Munich Court Theatre.
She died in Munich of a lung disease.

Question: Who is Margarethe Danzi's sibling-in-law?