Question: Which child of writer Loudon Snowden Wainwright Jr spent time performing in Greenwich Village? 

Context paragraphs:
History (Loudon Wainwright III album): History is the twelfth studio album by American singer-songwriter Loudon Wainwright III, released on September 21, 1992 on Charisma Records.  The album was recorded following the death of Wainwright's father, Loudon Wainwright Jr..  Regarding his father's death and its influence on "History", Wainwright stated that:

Suze Rotolo: Susan Elizabeth Rotolo (November 20, 1943 – February 25, 2011), known as Suze Rotolo ( ), was an American artist, and the girlfriend of Bob Dylan from 1961 to 1964.  Dylan later acknowledged her strong influence on his music and art during that period.  Rotolo is the woman walking with him on the cover of his 1963 album "The Freewheelin' Bob Dylan", a photograph by the Columbia Records studio photographer Don Hunstein.  In her book, "A Freewheelin' Time: A Memoir of Greenwich Village in the Sixties", Rotolo described her time with Dylan and other figures in the folk music and bohemian scene in Greenwich Village, New York.  She discussed her upbringing as a "red diaper" baby—a child of Communist Party USA members during the McCarthy Era.  As an artist, she specialized in artists' books and taught at the Parsons School of Design in New York City.

Sloan Wainwright: Sloan Wainwright (born 1957) is an artist and member of the American independent music scene.  Her musical style consists of a combination of folk, rock, jazz, and blues, an approach which owes itself to her time writing and performing throughout Greenwich Village.

Greenwich Village: Greenwich Village, often referred to by locals as simply "the Village", is a neighborhood on the west side of Lower Manhattan, New York City.  Greenwich Village has been known as an artists' haven, the Bohemian capital, the cradle of the modern LGBT movement, and the East Coast birthplace of both the Beat and '60s counterculture movements.  "Groenwijck", one of the Dutch names for the village (meaning "Green District"), was Anglicized to "Greenwich".  Two of New York's private colleges, New York University (NYU) and the New School, are located in Greenwich Village.

Loudon Wainwright III: Loudon Snowden Wainwright III (born September 5, 1946) is an American songwriter, folk singer, humorist, and actor.  He is the father of musicians Rufus Wainwright, Martha Wainwright, and Lucy Wainwright Roche; brother of Sloan Wainwright; and former husband of the late folksinger Kate McGarrigle.  He resides in Canada.

Loudon Wainwright Jr.: Loudon Snowden Wainwright Jr. (December 16, 1924 – December 12, 1988) was an American writer.  He was the father of folk singer Loudon Wainwright III and singer Sloan Wainwright, and grandfather to Rufus Wainwright, Martha Wainwright, and Lucy Wainwright Roche.

A. Loudon Snowden: Archibald Loudon Snowden (August 11, 1835 – September 7, 1912) was an American politician and diplomat during the late 19th century.

Greenwich Village Crew: The Greenwich Village Crew is a crew within the Genovese crime family, active in the Greenwich Village area of Manhattan.  It was originally controlled by Don Vito Genovese from the early 1920s until his arrest in the late 1950s.  In the early 1980s Capo Vincent Gigante, was made the "new boss" of the Genovese crime family.  He continued to operate from and with the "Greenwich Village Crew" members.  Today the crew is still active, but after the death of Dominick Canterino, it is uncertain who is controlling the crew.

Rod MacDonald: Rod MacDonald (born August 17, 1948) is an American singer-songwriter, novelist, and educator.  He was a "big part of the 1980s folk revival in Greenwich Village clubs", performing at the Speakeasy, The Bottom Line, Folk City, and the Songwriter's Exchange at the Cornelia Street Cafe for many years.  He co-founded the Greenwich Village Folk Festival.  He is perhaps best known for his songs "American Jerusalem", about the "contrast between the rich and the poor in Manhattan" ("Sing Out! "), "A Sailor's Prayer", "Coming of the Snow", "Every Living Thing", and "My Neighbors in Delray", a description of the September 11 hijackers' last days in Delray Beach, Florida, where MacDonald has lived since 1995.  His songs have been covered by Dave Van Ronk, Shawn Colvin, Four Bitchin' Babes, Jonathan Edwards, Garnet Rogers, Joe Jencks, and others.  His 1985 recording "White Buffalo" is dedicated to Lakota Sioux ceremonial chief and healer Frank Fools Crow, whom he visited in 1981 and 1985, and who appears with MacDonald in the cover photograph.  Since 1995 MacDonald has lived in south Florida, where his cd, "Later that Night" was named "Best Local Cd of 2014" by "The Palm Beach Post" and reached the top ten in national folk music charts.  His first novel, The Open Mike, about a young man in the open mike scene of Greenwich Village, was published on December 5, 2014, by Archway Publishing.

2 Horatio Street: 2-10 Horatio Street is a 17-story co-operative apartment building located between Greenwich and Eighth Avenues, on the corner of Greenwich Avenue, across from Jackson Square Park in the Greenwich Village neighborhood of Manhattan, New York City.  Built in 1929-31 and designed by Robert T. Lyons, the building is located within the Greenwich Village Historic District, but is not, of itself, a landmarked building.  The building also has the address 123-129 Greenwich Avenue.

Supporting paragraphs: Loudon Wainwright Jr. Sloan Wainwright
Answer: Sloan Wainwright