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.
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.
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 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 Crumb
Charles Vincent Crumb, Jr.
(March 13, 1942 – February 1992) was the older brother of American cartoonist Robert Crumb.
Eusebius (consul 359)
Flavius Eusebius( died after AD 371) was a Roman Senator, who was the brother- in- law of the emperor Constantius II.
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
Maxon Crumb
Maxon Crumb( born 1945 in Philadelphia, Pennsylvania) is an American artist.
He is the younger brother of underground cartoonist Robert Crumb and Charles Crumb, and the uncle of Sophie Crumb.
Robert Crumb
Robert Dennis Crumb (born August 30, 1943) is an American cartoonist and musician who often signs his work R. Crumb.
His work displays a nostalgia for American folk culture of the late 19th and early 20th centuries, and satire of contemporary American culture.
Crumb is a prolific artist and contributed to many of the seminal works of the underground comix movement in the 1960s, including being a founder of the first successful underground comix publication, "Zap Comix", contributing to all 16 issues.
He was additionally contributing to the "East Village Other" and many other publications, including a variety of one-off and anthology comics.
During this time, inspired by psychedelics and cartoons from the 1920s and 1930s, he introduced a wide variety of characters that became extremely popular, including countercultural icons Fritz the Cat and Mr. Natural, and the images from his "Keep on Truckin'" strip.
Sexual themes abounded in all these projects, often shading into scatological and pornographic comics.
In the mid-1970s, he contributed to the "Arcade" anthology; following the decline of the underground, he moved towards biographical and autobiographical subjects while refining his drawing style, a heavily crosshatched pen-and-ink style inspired by late 19th- and early 20th-century cartooning.
Much of his work appeared in a magazine he founded, "Weirdo" (1981–1993), which was one of the most prominent publications of the alternative comics era.
As his career progressed, his comic work became more autobiographical.
In 1991, Crumb was inducted into the comic book industry's Will Eisner Comic Book Hall of Fame.
He is married to cartoonist Aline Kominsky-Crumb, with whom he has frequently collaborated.
Their daughter Sophie Crumb has also followed a cartooning career.
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.

Question: Who is the sibling-in-law of Charles Crumb?