Question: Virginia Coigney is the mother of what singer who was part of a group with Peter Yarrow?

Context articles: Peter Yarrow
Eleanor Barooshian
Torn Between Two Lovers
No Easy Walk To Freedom
Puff, the Magic Dragon
Virginia Coigney
Mary Travers
Paul Stookey
Peter, Paul and Mary
Day Is Done (Peter, Paul and Mary song)

Peter Yarrow (born May 31, 1938) is an American singer and songwriter who found fame with the 1960s folk music trio Peter, Paul and Mary.
 Yarrow co-wrote (with Leonard Lipton) one of the group's greatest hits, "Puff, the Magic Dragon".
 He is also a political activist and has supported causes that range from opposition to the Vietnam War to the creation of Operation Respect, an organization that promotes tolerance and civility in schools.
Eleanor Barooshian (April 2, 1950 – August 30, 2016), also known as Eleanor Baruchian and as Chelsea Lee, was a member of the band the Cake (formed in New York in 1966).
 In 1967, Barooshian appeared in "You Are What You Eat", a documentary film produced by Peter Yarrow of folk group Peter, Paul & Mary.
 In the film, Barooshian performed the Sonny & Cher hit "I Got You Babe" with Tiny Tim.
 She sang the male part while Tiny sang the female.
 Yarrow cast them after seeing them perform at Steve Paul's The Scene in New York.
"Torn Between Two Lovers" is a pop song written by Peter Yarrow (of the folk music trio Peter, Paul & Mary) and Phillip Jarrell.
 The song describes a love triangle and laments that "loving both of you is breaking all the rules".
 Yarrow originally intended the song to be sung by a man, but it was ultimately made famous by a woman, Mary MacGregor, who recorded it at Muscle Shoals Sound Studio in 1976.
 The song became the title track of MacGregor's first album.
No Easy Walk to Freedom is a 1986 studio album by American folk music trio Peter, Paul and Mary.
 Its release coincided with the group's 25th anniversary.
 Produced by John McClure and Peter Yarrow, the album was nominated in the Best Contemporary Folk Album category at the 29th Annual Grammy Awards.
"Puff, the Magic Dragon" (or "Puff") is a song written by Leonard Lipton and Peter Yarrow, and made popular by Yarrow's group Peter, Paul and Mary in a 1963 recording.
Virginia A. Coigney (October 2, 1917 – December 18, 1997) was a civic leader, journalist and author.
 She married journalist and author Robert Travers in the mid-1930s by whom she became the mother of folk singer Mary Travers of Peter, Paul & Mary fame.
Mary Allin Travers (November 9, 1936 – September 16, 2009) was an American singer-songwriter and member of the folk music group Peter, Paul and Mary, along with Peter Yarrow and (Noel) Paul Stookey.
 Peter, Paul and Mary was one of the most successful folk-singing groups of the 1960s.
Noel Paul Stookey (born December 30, 1937) is an American singer-songwriter.
 Stookey is known by his stage name, "Paul", in the folk trio Peter, Paul and Mary; however, he has been known by his first name, "Noel", throughout his life.
 He continues to work as a singer and an activist, performing as a solo artist, and occasionally performing with Peter Yarrow.
Peter, Paul and Mary was an American folk group formed in New York City in 1961, during the American folk music revival phenomenon.
 The trio was composed of tenor Peter Yarrow, baritone Noel Paul Stookey and alto Mary Travers.
 The group's repertoire included songs written by Yarrow and Stookey, as well as covers written by other folk musicians.
 After the death of Travers in 2009, Yarrow and Stookey continued to perform as a duo under their individual names.
"Day Is Done" is a song written by Peter Yarrow.
 It was recorded by Yarrow's group Peter, Paul and Mary and released as a single in 1969.
 The song reached No. 21 on "Billboard" Hot 100, and was ranked No. 48 on the "Billboard" year-end Top Easy Listening Singles chart of 1969.