Question: Which retired Australian musician and songwriter is  George Redburn Young  younger brother
Context: Christopher James Cester (born 16 September 1981) is an Australian musician.  He was the founding mainstay drummer and backing vocalist of rock band, Jet.  His older brother is Nic Cester (born 6 July 1979), the band's mainstay lead singer and front man.  As a member of Jet, Cester has won awards as a songwriter from the Australasian Performing Right Association (APRA) including in 2005 as Songwriter of the Year, and 2011 for "Seventeen", which won Most Played Australian Work and Rock Work of the Year.  In March 2012 Jet announced their disbandment. Alexander Young (28 December 1938 – 4 August 1997), also known as George Alexander, was a Scottish singer, songwriter, saxophonist, bassist, guitarist and session musician.  He is an elder brother of George Young, the rhythm guitarist and founding member of the Easybeats, as well as Malcolm and Angus Young, founding members of the Australian hard rock band AC/DC, and the younger brother of Stephen Young, the father of Stevie Young, who was also a member of AC/DC. George Redburn Young (born 6 November 1946) is an Australian musician, songwriter and record producer.  Born in Scotland, he moved to Australia with his family as a teenager, and became a naturalised citizen.  He is best known as a member of the 1960s Australian rock band the Easybeats, and as a co-writer of the international hits "Friday on My Mind" and "Love Is in the Air", the latter recorded by John Paul Young (no relation).  Young was also the producer of some work by the Australian hard rock band AC/DC, formed by his younger brothers Malcolm and Angus Young. Nicholas George "Nick" Littlemore (born 6 May 1978) is an Australian musician and record producer.  As a musician, he is the frontman of the electronic duo Pnau (with Peter Mayes), a member of the art-rock band Teenager (with Pip Brown, now known as Ladyhawke) and one part of the electro pop-duo Empire of the Sun (with Luke Steele).  As a record producer, he has worked with Elton John, Robbie Williams, Lover Lover, Ellie Goulding, Lost Valentinos, Mercy Arms, Groove Armada and Mika.  From late 2009, Littlemore had worked with the Cirque Du Soleil as a composer and musical director for the touring arena show, "Zarkana", which debuted on 29 June 2011.  His older brother Sam La More is also a musician and record producer. Johanna Paton Pigott (born ca. 1955) is an Australian musician, singer-songwriter and screenwriter.  Her best known hit songs are Dragon's "Rain" which peaked at No. 2 on the Australian Kent Music Report Singles Chart in 1983, and John Farnham's "Age of Reason".  "Rain" was co-written with partner Dragon's Todd Hunter and his younger brother, Marc Hunter.  When "Age of Reason" reached the top of the charts in July 1988, Pigott became the first Australian woman to have written a No. 1 hit.  It was co-written with Todd Hunter. Allen John Jakovich (born 21 March 1968) is a retired Australian rules football player.  Jakovich was a prolific full forward and is notable for kicking 208 goals in his 54 Australian Football League matches, an average of 3.85 per game, for Melbourne and Footscray.  He and his younger brother, Glen Jakovich, both began their AFL careers in the 1990 AFL Draft. Mark Larry Taufua is a retired Australian professional rugby league player.  He is of Samoan descent, and lasted played for the Cronulla-Sutherland Sharks in the National Rugby League.  He previously played for the Newcastle Knights.  He primarily played prop and lock.  His younger brother Larry Jnr, played for the Newcastle Knights in the Jersey Flegg Cup in 2006 and 2007. Kym Warner is an Australian musician and record producer, and a founding member of the American bluegrass band The Greencards.  Warner was an aspiring bluegrass musician (which was unusual in Australia at the time) after inheriting the music from his father, an early Australian bluegrass pioneer.  The winner of the Australian National Bluegrass Mandolin Championship for four consecutive years, Warner had toured with country music artists Gina Jeffreys, and with Young again in Kasey Chambers's band.  Before the band formed, Carol Young and Warner both knew each other, and according to Warner had been drawn to bluegrass and American roots music through an appreciation of George Jones and Merle Haggard.  After meeting, Warner and Young made the decision to emigrate to America, to pursue musical careers there.  Later, Young and Warner were living together in Sydney, and trying to find work in the moribund Australian bluegrass scene.  After leaving Australia, they spent time in West Texas before relocating to Austin. Malcolm Mitchell Young (born 6 January 1953) is a retired Australian musician and songwriter, best known as a co-founder, rhythm guitarist, backing vocalist and songwriter for the hard rock band AC/DC.  Except for a brief absence in 1988, he was with the band from its November 1973 beginning until retiring permanently in 2014, due to health reasons.  Young and the other members of AC/DC were inducted into the Rock and Roll Hall of Fame in 2003. Baron Colebrooke, of Stebunheath in the County of Middlesex, was a title in the Peerage of the United Kingdom.  It was created in 1906 for Sir Edward Colebrooke, 5th Baronet.  He held several positions at the British court.  The Colebrooke family descended from the London banker James Colebrooke.  His second son James Colebrooke represented Gatton in the House of Commons.  On 12 October 1759 he was created a baronet, of Gatton in the County of Surrey, in the Baronetage of Great Britain, with remainder to his younger brother George.  He was succeeded according to the special remainder by his younger brother George, the second Baronet.  He was Member of Parliament for Arundel and also served as Chairman of the Honourable East India Company.
Answer: Malcolm Mitchell Young