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

<P0-S0> Carl Henry Lindner III is an American businessman. <P0-S1>  He has served as the co-chief executive officer of American Financial Group since January 2005. <P0-S2>  He has also acted as chief executive officer and majority owner of FC Cincinnati since the club's founding in 2015. <P0-S3>  He is the son of Carl Lindner Jr. and a prominent member of the Lindner family. <SEP> <P1-S0> The Lindner family is a family that has been prominent in the Cincinnati metropolitan area since the mid-20th century. <P1-S1>  They are known for their work in the insurance and investments business. <P1-S2>  As of 2015, "Forbes" ranks them as the 129th richest family in the United States. <P1-S3>  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. <SEP> <P2-S0> Terry Semel (born February 24, 1943) is an American corporate executive who was the chairman and CEO of Yahoo! Incorporated from 2001 to 2007. <P2-S1>  Previously, he spent 24 years at Warner Bros., where he served as chairman and co-chief executive officer. <P2-S2>  He resigned as CEO due in part to pressure from shareholders' dissatisfaction over his compensation (in 2006, salary $1, stock options worth $70 million) and performance. <P2-S3>  He is also the founder of Windsor Media which has produced "Rules Don't Apply" starring Lily Collins and Warren Beatty. <SEP> <P3-S0> Siddharth N. "Bobby" Mehta was former CEO and vice chairman of HSBC North America. <P3-S1>  He served as unit chairman of HSBC Holdings PLC and served as its board member since March 2005. <P3-S2>  He has been an independent director of The Allstate Corporation since February 19, 2014. <P3-S3>  Mehta serves as consultant of TransUnion. <P3-S4>  He served the chief executive officer and president of TransUnion from August 2007 to December 31, 2012, and Transunion Financing Corp. until December 31, 2012. <P3-S5>  He oversaw HSBC's global credit card services, its North American consumer lending and mortgage services businesses and its first mortgage operation. <P3-S6>  He served as the chief executive officer of HSBC Bank USA, N.A. until February 2007. <P3-S7>  He stepped down as head of the North American unit after the lender raised its forecast for bad loans in the U.S. <P3-S8>  Mehta joined Household International Inc., in 1998. <P3-S9>  He is of Indian descent. <P3-S10>  Mehta serves on the board of international advisors for the Monterey, California, Institute of International Studies and is a member of the Financial Services Roundtable. <P3-S11>  He served as chairman and chief executive officer of HSBC Financial Corp., Ltd. <P3-S12>  Mehta served as group managing director of HSBC Holdings PLC of HSBC Finance Corp. since April 30, 2005, and its unit chief executive officer since March 2005. <P3-S13>  He served as vice chairman and director of HSBC Financial Corporation Limited., (Formerly Household International Inc.). <P3-S14>  He served as senior vice president of The Boston Consulting Group in Los Angeles and co-leader of Boston Consulting Group Financial Services Practice in the United States.