Question: Who is the sibling of the composer of Downtown?

full_context: Document 1: James Young (Upper Canada politician): He was born in Nova Scotia in 1777 and settled in Ameliasburgh Township in Upper Canada. In 1808, he was named justice of the peace in the Midland District. He served in the local militia during the War of 1812 and became lieutenant colonel in 1824. He represented Hastings & Ameliasburg in the 6th Parliament of Upper Canada. He died at Carrying Place in 1831.
Document 2: William Young (Nova Scotia politician): Born in Falkirk, the son of John Young and Agnes Renny, Young was first elected to the Nova Scotia House of Assembly in 1836 as a Reformer (or Liberal) and, as a lawyer, defended Reform journalists accused of libel. When responsible government was instituted in 1848, Young hoped to become the first Premier but was passed over in favour of fellow reformer James Boyle Uniacke and Young became Speaker. However, Young succeeded Uniacke in 1854.
Document 3: Jacob Richler: Jacob Richler is a Canadian newspaper and magazine journalist, and the son of novelist Mordecai Richler and Florence Isabel (Wood). He was the inspiration for his father's "Jacob Two-Two" trilogy of children's books.
Document 4: John Walter Scott: John Walter Scott (November 2, 1845 – January 4, 1919) of New York City, was originally from England, but he emigrated to the United States to take part in the California Gold Rush. Unsuccessful at the prospecting trade, Scott began to sell postage stamps for collectors and in a short period of time became the nation's leading stamp dealer. During his lifetime, he was known as "The Father of American Philately" by his fellow stamp collectors.
Document 5: Downtown (Lady Antebellum song): "Downtown" is a song recorded by American country music group Lady Antebellum. It was released on January 22, 2013, as the first single from their fifth studio album "Golden". The song was written by Luke Laird, Shane McAnally, and Natalie Hemby. It was originally planned to be sung by fellow country act Miranda Lambert.
Document 6: Downtown Blues: The Grammy-nominated Downtown Blues is Steve Allee's second album. This album contains music from the John Von Ohlen, Chuck Carter and Steve Allee Big Bands.
Document 7: Rockin' in the Free World: "Rockin' in the Free World" is a song by Neil Young, released on his 1989 album "Freedom". Two versions of the song were released, similarly to the song "Hey Hey, My My (Into the Black)" of Young's "Rust Never Sleeps" album, one of which is performed with a predominantly acoustic arrangement, and the other with a predominantly electric arrangement. The song is now considered one of Neil Young's best songs. The song was ranked 216 on Rolling Stone's 500 Greatest Songs of All Time.
Document 8: Cowgirl in the Sand: "Cowgirl in the Sand" is a song written by Neil Young and first released on his 1969 album "Everybody Knows This Is Nowhere". Young has also included the live versions of the song on several albums and on the Crosby, Stills, Nash and Young album "4 Way Street". It has also been covered by The Byrds on their self-titled album. Like two other songs from "Everybody Knows This Is Nowhere", "Cinnamon Girl" and "Down by the River", Young wrote "Cowgirl in the Sand" while he was suffering from the flu with a high fever at his home in Topanga, California.
Document 9: Scott Young (writer): Scott Alexander Young (April 14, 1918 – June 12, 2005) was a Canadian journalist, sportswriter, novelist and the father of musicians Neil Young and Astrid Young. Over his career, Young wrote 45 books, including novels and non-fiction for adult and youth audiences.
Document 10: The Needle and the Damage Done: "The Needle and the Damage Done" is a song by Neil Young that describes the destruction caused by the heroin addiction of musicians he knew including his friend and Crazy Horse bandmate Danny Whitten. It previews the theme of the "Tonight's the Night" album that reflects Young's grief over the heroin overdose and death of both Whitten and Bruce Berry, a roadie for Young and Crazy Horse.
Document 11: Downtown (Neil Young song): "Downtown" is the first single from Neil Young's twenty-third studio album, "Mirror Ball". The song was recorded with the members of American rock band Pearl Jam. The song was nominated for Best Rock Song at the 1996 Grammy Awards.
Document 12: This Note's for You: This Note's for You is the 16th studio album by Canadian musician Neil Young, released on April 11, 1988 on Reprise. It was originally credited to "Young and the Bluenotes." Part of the album's concept centered on the commercialism of rock and roll, and tours in particular. (The title selection, specifically, is a hostile social commentary on concert sponsorship.) The music is marked by the use of a horn section. It also marked Young's return to the recently re-activated Reprise Records after a rocky tenure with Geffen Records.
Document 13: Decade (Neil Young album): Decade is a compilation album by Canadian musician Neil Young, originally released in 1977 as a triple album, now available on two compact discs. It contains 35 of Young's songs recorded between 1966 and 1976, among them five tracks that had been unreleased up to that point. It peaked at No. 43 on the "Billboard" Top Pop Albums chart, and was certified platinum by the RIAA in 1986.
Document 14: Jock Young: Jock Young was educated at the London School of Economics. His PhD was an ethnography of drug use in Notting Hill, West London, out of which he developed the concept of moral panic. The research was published as "The Drugtakers". He was a founding member of the National Deviancy Conferences and a group of critical criminologists in which milieu he wrote the groundbreaking, "The New Criminology: For a Social Theory of Deviance" in 1973, with Ian Taylor and Paul Walton and "The Manufacture of News" (with Stan Cohen).
Document 15: Nick Sagan: Nick Sagan (born September 16, 1970 in Boston, Massachusetts) is an American novelist and screenwriter. He is the author of the science fiction novels "Idlewild", "Edenborn", and "Everfree", and his screen credits include episodes of "" and "". He is the son of astronomer Carl Sagan and artist and writer Linda Salzman.
ground_truth: Astrid Young
sub_queries: Downtown >> composer Answer: Neil Young
Neil Young >> sibling Answer: Astrid Young