Question: Who is the father of the world's youngest billionaire as of 2016?

full_context: Document 1: Alice Walton: Alice Louise Walton (born October 7, 1949) is an American heiress to the fortune of Wal-Mart Stores, Inc. She is the daughter of Wal-Mart founder Sam Walton and Helen Walton, and sister of S. Robson Walton, Jim Walton and the late John T. Walton. With a net worth of $40.8 billion she is the wealthiest woman in the world, according to "Forbes", following the death of Liliane Bettencourt in September 2017.
Document 2: Black billionaires: According to Forbes 2014 ranking of the world's billionaires, Nigerian business magnate Aliko Dangote with a net worth of $25 billion is the world's richest black person. Others on the list are Nigeria's Mike Adenuga with $4.6 billion, American media mogul Oprah Winfrey with a net worth of $3.9 billion (2015) and South African gold magnate Patrice Motsepe, with $2.9 billion, Nigeria's Folorunsho Alakija with $2.5 billion and Mo Ibrahim, a British billionaire of Sudanese Nubian ancestry, who has been on the "Forbes" Billionaire list since 2008 and in 2012 had a net worth of $1.1 billion.
Document 3: Alexandra Andresen: Alexandra Gamlemshaug Andresen (born 23 July 1996) is a Norwegian heiress, and as of 2016 , the world's youngest billionaire. Her net worth is estimated at $1.2 billion (£862 million).
Document 4: Perenna Kei: Perenna Kei (, rendered as Kei Hoi Ting in Cantonese and Ji Kaiting in Mandarin pinyin; born 1990 in Hong Kong), is a Chinese businesswoman and billionaire. In 2014, "Forbes" named her the youngest billionaire in the world at age 24, with a net worth of US$1.3 billion. She previously used the name Ji Peili.
Document 5: Newshold: Newshold SGPS is a Luso-Angolan media group, owned by Pineview Overseas, a Panama-based company, whose shareholders are powerful Angolan figures including tycoon Alvaro Sobrinho, who represents the Madalena family in this group. The company headquarters is in Lisbon. It has a share of 15.08% in Cofina, which owns the daily sales leader, the "Correio da Manhã", the largest-circulation Lisbon based tabloid. Newshold controls 97% of "Sol", Portugal's third largest weekly newspaper, fully owns daily newspaper "i" and owns minor stakes in two leading magazines, "Visão" and "Expresso".
Document 6: Ferd (company): Ferd is a Norwegian holding company which holds partial ownership in companies within industry and finance as well as a real estate portfolio. The company has 37 employees and is owned by Johan H. Andresen and his two daughters Katharina and Alexandra; it was established in 2001. The group also has a number of venture and private equity holdings.
Document 7: Canica: Canica is a private holding company, based in Oslo, Norway, created to own the RIMI grocery store chain, owned by Stein Erik Hagen (10%) and his three children Caroline Marie Hagen, Carl Erik Hagen and Nina Camilla Hagen (30% each). The company is the largest owner of Orkla (17.4%), Jernia (100%), Komplett (56.21%), Ignis and Steen & Strøm (49.9%). The company was founded in 1985 to own the RIMI grocery store chain that Hagen had started. This was sold to ICA in 2004.
Document 8: Isabel dos Santos: Isabel dos Santos (born 20 April 1973) is an Angolan businesswoman. In 2013, according to research by "Forbes", her net worth had reached more than three billion US dollars, making her Africa’s first billionaire woman. She is the daughter of Angola's President José Eduardo dos Santos, who has ruled the country since 1979. A "Forbes" magazine article described in 2013 how Isabel dos Santos acquired her wealth by taking stakes in companies doing business in Angola, suggesting that her wealth comes almost entirely from her family's power and connections. In November 2015, the BBC named Isabel dos Santos as one of the 100 most influential women in the world.
Document 9: Sampo Group: Sampo Group is a Nordic financial company made up of the parent company Sampo plc and If P&C Insurance Holding Ltd and Mandatum Life Insurance Company Ltd, both of which are its fully owned subsidiaries. The Helsinki-based parent company administers the subsidiaries. Sampo Group employs nearly 6,800 employees. Kari Stadigh is the Group CEO and President for Sampo.
Document 10: Albert, 12th Prince of Thurn and Taxis: Albert Maria Lamoral Miguel Johannes Gabriel, 12th Prince of Thurn and Taxis (Albert Fürst von Thurn und Taxis; born 24 June 1983), is a German aristocrat, businessman, and race car driver. He has been listed as the world's youngest billionaire many times since his father's death in 1990, first appearing on the list when he was age eight.
Document 11: Johnson Financial Group: Johnson Financial Group, Inc is the holding company of Johnson Bank, Johnson Insurance, as well as Swiss banking company; Banque Franck, Galland & Cie. It has an estimated AUM of $4 billion and is the financial services subsidiary of the larger Johnson Family Enterprises Group of Companies. The company was founded in 1970 but wasn't incorporated until 1989 and has grown from a single bank holding company to a global organization providing a full range of financial services to businesses and individuals. Johnson Financial Group employs 1100 people and has over 40 locations in Wisconsin and Arizona. Helen Johnson-Leipold, one of Samuel Curtis Johnson Jr.'s 4 children, serves as chairman of the company. The company also had equity in Cayman Island-based TransOcean Bank & Trust, Ltd.
Document 12: Signa Holding: Signa Holding GmbH (officially written as SIGNA) is Austria’s largest privately owned real estate company. Signa was founded in 1999 by the Tyrolean entrepreneur René Benko. Over the years, the two-man company with an initial focus on classic real estate development has become a pan-European real estate group with more than 150 employees and offices in Vienna, Innsbruck, Munich, Düsseldorf, Zurich and Luxembourg. The principal focus of the Signa Group of Companies is the long-term investment in real estate in prime city centre locations.
Document 13: Fernando Rodés Vilà: Fernando Rodés Vilà (born August 1, 1960 in Barcelona), is a businessman specialized in marketing, communications and sustainability, and invests and manages companies operating in those fields. Fernando is currently Vice Chairman of Havas (ticker: HAV) after having been its CEO 2006-2011, and CEO of MPG Havas Media 1999-2006. He is founder, with his family, of the holding company ISP and several of its subsidiaries: Digilant, Acceso, In-Store Media and Antevenio (ticker: ALANT) among others. Fernando is Founder and Chairman of Ara (newspaper) the leading digital and print media platform launched in Barcelona in 2010; Board member of Acciona (ticker: ANA) and Chairman of its Appointments and Retribution Committee; and one of the Spanish members of the Trilateral Commission.
Document 14: Katharina Andresen: Katharina Gamlemshaug Andresen (born 21 May 1995) is a Norwegian heiress, and as of March 2016, the world's second youngest billionaire ($1.15 billion) as reported by "Forbes".
Document 15: Anders Holch Povlsen: Anders Holch Povlsen (born 1972) is a Danish billionaire who is the CEO and sole owner of the international clothes retailer chain Bestseller-Group (Vero Moda, Jack&Jones, etc.), a company founded by his parents, and the biggest shareholder in the British internet clothes retailer Asos and biggest shareholder in German internet clothes retailer Zalando. He is the second largest private landowner in Britain.
ground_truth: Johan H. Andresen