Question: Ranked the 129th richest family in the United States, where has their son served as the co-chief executive officer of?

full_context: Document 1: 3G Capital: 3G Capital is an American/Brazilian multibillion-dollar investment firm, founded in 2004 by principals Jorge Paulo Lemann, Carlos Alberto Sicupira, Marcel Herrmann Telles and Roberto Thompson Motta. The firm is best known for partnering up with Berkshire Hathaway for its acquisitions, including those of Burger King, Tim Hortons, Heinz and Kraft Foods.
Document 2: Frank Fertitta III: Frank Joseph Fertitta III (born February 24, 1962) is an American entrepreneur. He is the current CEO of Station Casinos. He is also an owner of Zuffa LLC, which is the entity that formerly ran the Ultimate Fighting Championship (UFC).
Document 3: Carl H. Lindner College of Business: The Carl H. Lindner College of Business, also referred to as "Lindner" and "Lindner College," is a college of the University of Cincinnati. The college is located in Carl H. Lindner Hall. On June 21, 2011 the college was named after Carl Henry Lindner, Jr. in honor of the contributions he has made to the university, college, and the business community. The college has three undergraduate degree options, five master's degrees, and a doctoral program spread out over seven departments.
Document 4: Clark Hunt: Clark Knobel Hunt (born February 19, 1965) is Chairman, CEO, and part owner of the National Football League's Kansas City Chiefs and a founding investor-owner in Major League Soccer. Hunt also serves as chairman of Hunt Sports Group, where he oversees the operations of FC Dallas and, formerly, the Columbus Crew of MLS. He is the son of Lamar Hunt and the grandson of oil tycoon H.L. Hunt. Following the death of his father Lamar Hunt in 2006, Hunt co-inherited ownership of the Kansas City Chiefs. Clark serves as the ultimate authority as Chairman and CEO.
Document 5: Widener family: The American Widener family of Peter Arrell Brown Widener (1834–1915) and his wife Hannah Josephine Dunton (1836–1896) were from Philadelphia, Pennsylvania, and were one of the wealthiest families in the United States. In 1883 Widener was part of the founding partnership of the Philadelphia Traction Company and used the great wealth accumulated from that business to become a founding organizer of U.S. Steel and the American Tobacco Company.
Document 6: Wayne Huizenga: Harry Wayne Huizenga ( , born December 29, 1937) is an American businessman and entrepreneur. He has been involved in the founding of three Fortune 500 corporations and is responsible for six New York Stock Exchange listed companies. He has also been an owner of three top tier professional sports franchises.
Document 7: Joshua Kushner: Joshua Kushner (born June 12, 1985) is an American businessman and investor. He is the founder and managing partner of the investment firm Thrive Capital, co-founder of Oscar Health, and the son of real estate magnate Charles Kushner. His brother is Jared Kushner, the son-in-law and senior advisor of the US President Donald Trump.
Document 8: Ted Lerner: Theodore N. "Ted" Lerner (born October 15, 1925) is an American real estate developer, managing principal owner of the Washington Nationals baseball team, and founder of the real estate company Lerner Enterprises, the largest private landowner in the Washington metropolitan area, which owns commercial, retail, residential and hotel properties, as well as Chelsea Piers in New York City. In 2015, "Forbes" magazine named him the richest person in the State of Maryland.
Document 9: C. Stephen Lynn: C. Stephen Lynn is an American businessman and philanthropist from Tennessee. He spent the bulk of his career in the fast food industry, serving as the Chairman and CEO of the Sonic Corporation from 1983 to 1995, Chairman and CEO of Shoney's from 1995 to 1998, and CEO of Back Yard Burgers from 2007 to 2010. Lynn currently serves as CEO of GGR Enterprises, a motorsports marketing enterprises headquarter in North Carolina.
Document 10: D.C. United Holdings: D.C. United Holdings is the holding company that controls operating rights to D.C. United, a professional soccer club that is part of Major League Soccer (MLS). The company, founded in 2007, was initially led by William H.C. Chang (chairman of Westlake International Group), Brian Davis and Christian Laettner (co-managers of Blue Devil Ventures), and Kevin Payne (president of D.C. United) who maintained his position with the new investors. At the time of formation, D.C. United Holdings was also interested in adding Discovery Communications founder John Hendricks, also the founder of the now-defunct Women's United Soccer Association, to the "majority-minority" group. Brian Davis and former owner Victor MacFarlane were the first African-American owners in MLS; William H.C. Chang is the first Asian-American. D.C. United Holdings bought D.C. United from Anschutz Entertainment Group for $33 million, a record fee for operational rights to an MLS club. The group is pursuing a soccer-specific stadium for D.C. United in the Washington area.
Document 11: FC Cincinnati: FC Cincinnati is a United Soccer League (USL) club based in Cincinnati, Ohio that began play in 2016. The team was announced on August 12, 2015. The club's ownership group is led by Carl H. Lindner III. Alan Koch currently coaches the team.
Document 12: John Coates (businessman): John Fitzgerald Coates (born January 1970), is an English businessman and joint chief executive (CEO) of online gambling company Bet365. He has been listed in the "Forbes" magazine’s 29th annual rich list, with an estimated personal fortune of $1.3 billion (roughly £850 million).
Document 13: Thomas S. Ricketts: Thomas S. "Tom" Ricketts (born May 23, 1966) is the chairman and owner of the Chicago Cubs, and the chief executive officer of Incapital LLC, a Chicago investment bank that packages corporate bonds for retail investors. He is also a director of TD Ameritrade Holding Corporation as well as the son of Ameritrade founder J. Joseph Ricketts. "Forbes" estimate of the Ricketts's family wealth ($1 billion), consolidated under J. Joseph Ricketts name, placed the family at #371 on the Forbes 400 list.
Document 14: Lindner family: The Lindner family is a family that has been prominent in the Cincinnati metropolitan area since the mid-20th century. They are known for their work in the insurance and investments business. As of 2015, "Forbes" ranks them as the 129th richest family in the United States. They are also known for their involvement in professional sports; Carl Jr. was a part owner and CEO of the Cincinnati Reds, Carl III is the majority owner and CEO of FC Cincinnati, and the family's contributions to the Western & Southern Open led to its venue being titled the Lindner Family Tennis Center.
Document 15: Carl Lindner III: Carl Henry Lindner III is an American businessman. He has served as the co-chief executive officer of American Financial Group since January 2005. He has also acted as chief executive officer and majority owner of FC Cincinnati since the club's founding in 2015. He is the son of Carl Lindner Jr. and a prominent member of the Lindner family.
ground_truth: American Financial Group since