Question: Who is the mother of Extra Playful's producer?

full_context: Document 1: Hywel Teifi Edwards: Born and raised in Aberarth, Ceredigion, Edwards attended Aberaeron Grammar School and the University College of Wales, Aberystwyth. He taught Welsh at Garw Grammar School, Pontycymmer, where he met his wife Aerona, before becoming an extramural lecturer in Welsh literature at University of Wales, Swansea, and later Professor and Head of the Welsh Department. He and his wife had two children, Huw Edwards and Meinir Edwards now Menir Krishnasamy. He retired from full-time teaching in 1995 but continued to lecture and write books. Edwards was the leading authority on the history of the National Eisteddfod of Wales.
Document 2: Animal Justice: Animal Justice is the first EP by Welsh musician John Cale. It was released in September 1977 by record label Illegal.
Document 3: Extended Play (Austin Mahone EP): Extended Play is an extended play (EP) by American artist Austin Mahone released on May 29, 2013 from Republic Records only in Japan.
Document 4: Circus Live: Circus Live is a 3-disc live album by John Cale released on February 19, 2007. The contents were recorded live on the 2004 and 2006 European tours. One of the discs is a DVD containing rehearsal footage, a music video, and a two audio tracks.
Document 5: Idwal Robling: Robling was born in Ynyshir in the Rhondda Valley, where he attended the local grammar school. His education was interrupted by the Second World War, and upon being called up was accepted for service in the Royal Navy. However, he was selected by ballot to become a Bevin Boy so instead of going to the Navy he was conscripted to work in the coal mines. After the war, he resumed his education and qualified as a teacher after attending Caerleon College and Loughborough University, although instead of teaching he decided on a different career and became a manager at the Lovell's sweet factory in Newport, Monmouthshire.
Document 6: Roger Waters: Waters was born on 6 September 1943, the younger of two boys, to Mary (née Whyte; 1913–2009) and Eric Fletcher Waters (1914–1944), in Great Bookham, Surrey. His father, the son of a coal miner and Labour Party activist, was a schoolteacher, a devout Christian, and a Communist Party member. In the early years of the Second World War, Waters' father was a conscientious objector who drove an ambulance during the Blitz.
Document 7: Journals (album): On December 9, 2013, Bieber announced that the ten Music Monday releases would be packaged with an additional five new songs in a compilation entitled Complete My Journals. Although the album was initially set for release on December 16, 2013, the date was pushed back one week to December 23, as Bieber intended to include one more song on the compilation. Though it does not appear on the album itself, the bonus track, ``Flatline '', was available for a free download on the iTunes Store for a limited time. Journals was available on iTunes from January 2, 2014, and all sixteen songs are available for purchase individually. According to one of its producers and Bieber's personal friend, Jason`` Poo Bear'' Boyd, the album was supposed to receive a full release, as well as its singles to be promoted on radio, however the label did n't support it because it was n't the direction they wanted Justin to go. It was, however, eventually released on LP in 2016.
Document 8: Gwynfor Evans: Gwynfor Evans was born in Barry, near Cardiff, to Dan Evans and Catherine Richard. He had a brother named Alcwyn, and a sister named Ceridwen. His father ran a chain of shops in Barry, and his mother a china shop. His mother was a fluent Welsh speaker. As a boy, he was educated at Gladstone Road School. Later on he was educated at Barry County School, where he was captain of the school's cricket and hockey teams. At the school he began learning the Welsh language, but did not become fully fluent until the age of seventeen.
Document 9: John Cale: John Davies Cale was born on 9 March 1942 in Garnant in the industrial Amman Valley of Wales to Will Cale, a coal miner, and Margaret Davies, a primary school teacher. Although his father spoke only English, his mother spoke and taught Welsh to Cale, which hindered his relationship with his father, although he began learning English at primary school, at around the age of seven. Cale was molested by two different men during his youth, an Anglican priest who molested him in a church and a music teacher.
Document 10: Bramwell Booth: Born in Halifax, Yorkshire, England, the oldest child born to William Booth and Catherine Mumford, he had two brothers and five sisters, including Evangeline Booth, Catherine Booth-Clibborn, Emma Booth and Ballington Booth. The Booth family regularly moved from place to place as William Booth's ministry necessitated until the family finally settled in London in 1865. Bramwell Booth was involved in The Salvation Army right from its origins as the obscure Christian Mission, established in Whitechapel in 1865, into an international organisation with numerous and varied social activities. He was educated at home, briefly at a preparatory school and at the City of London School, where he was bullied.
Document 11: Kenton Cool: Cool was born in Slough, Berkshire in 1973. His family surname was originally Kuhle and was changed during the Second World War by his half-German grandfather. His father was a photographer and his mother a florist, and the family home was near to Uxbridge, in Middlesex. He was schooled at John Hampden Grammar School in High Wycombe, and later obtained a place at the University of Leeds. Kenton Cool graduated from the University of Leeds in 1994 after studying BSc Geological Sciences.
Document 12: Extra Playful: Extra Playful is a 2011 EP by John Cale. The EP features 5 previously unreleased songs. Black Edition (released on Black Friday) contains two more extra songs.
Document 13: 5 Tracks: 5 Tracks is the second extended play by Welsh musician John Cale, released in May 2003 and comprising five previously unreleased songs. It was Cale's first release for EMI. The EP was followed by the album "HoboSapiens", which was released in October 2003 and does not contain any songs from this EP.
Document 14: SPY Records: SPY Records closed in 1980. John Cale then released three albums on ZE Records: "Music For A New Society" (1982), "Caribbean Sunset" (1983) and "Comes Alive" (1984).
Document 15: Ed Sheeran: Sheeran was born in Halifax, West Yorkshire on 17 February 1991. When he was a child, he moved with his family from Hebden Bridge to Framlingham in Suffolk. He has an older brother named Matthew who works as a composer. Sheeran's parents, John and Imogen, are from London. His paternal grandparents are Irish, and Sheeran has stated that his father is from a "very large" Catholic family. John is an art curator and lecturer, and Imogen is a culture publicist turned jewellery designer. His parents ran Sheeran Lock, an independent art consultancy, from 1990 to 2010.Sheeran sang in a local church choir from the age of four, learned to play the guitar during his time at Rishworth School, and began writing songs while at Thomas Mills High School in Framlingham. He was accepted at the National Youth Theatre in London as a teenager. He successfully auditioned for Youth Music Theatre UK in 2007 and joined their production of Frankenstein in Plymouth. He is a patron of Youth Music Theatre UK (now renamed British Youth Music Theatre) and of Access to Music, where he studied Artist Development. Sheeran is a second cousin of Northern Irish broadcaster Gordon Burns, who hosted the British game show The Krypton Factor.
ground_truth: Margaret Davies
sub_queries: Extra Playful >> producer Answer: John Cale
Who is the mother of John Cale ? Answer: Margaret Davies