Abby May
Abigail "Abba" Alcott (née May; October 8, 1800 – November 25, 1877)
May was an activist for several causes and one of the first paid social workers in the state of Massachusetts.
She was the wife of Transcendentalist Amos Bronson Alcott and mother of four daughters, including Civil War novelist Louisa May Alcott.
Samuel Joseph (sculptor)
Samuel Joseph( 1791 –1 July 1850) was a British sculptor, working in the early 19th century.
Joseph May
Joseph May is a British actor, voice actor and singer who has appeared in television and film.
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.
Sam Minihan
Samuel Joseph Minihan( born 16 February 1994) is an English footballer who plays for Stockport County.
Sam Austin
Samuel Joseph Austin( born 19 December 1996) is a footballer who plays as a forward for Kidderminster Harriers.
Jenny Joseph
Jenny Joseph( 7 May 1932 – 8 January 2018) was an English poet.
Sam Finley
Samuel Joseph Finley( born 4 August 1992) is an English professional footballer who plays as a midfielder for League One club Accrington Stanley.
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.
Samuel Joseph May
Samuel Joseph May (September 12, 1797 – July 1, 1871) was an American reformer during the nineteenth century, and championed multiple reform movements including education, women's rights, and abolitionism.
May argued on behalf of all working people that the rights of humanity were more important than the rights of property and advocated for minimum wages and legal limitations on the amassing of wealth.
He was born on September 12, 1797, in an upper class Boston area.
May was the son of Colonel Joseph May, a merchant, and Dorothy Sewell, who was descended from or connected to many of the leading families of colonial Massachusetts, including the Quincys and the Hancocks.
His sister was Abby May Alcott, mother of novelist Louisa May Alcott.
In 1825, he married Lucretia Flagge Coffin with whom he had five children.
Author Eve LaPlante, who wrote several books about his sister Abby May Alcott and a book about Sewall ancestor, Judge Samuel Sewall is one of his direct descendants.

Question: Who is Samuel Joseph May's sibling-in-law?
Answer: Amos Bronson Alcott