Question: When was the brother of Alfrederick born who was also  three-time Olympic gold medalist ?

Context articles: Barbara Krause
Rowdy Gaines
Sandy Neilson
Sun Yang
Jackie Joyner-Kersee
Steve Fraser
Al Joyner
Mike Heath (swimmer)
James Tomkins (rower)
Kerri Walsh Jennings

Barbara Krause (born 7 July 1959 in East Berlin) is a former freestyle swimmer from East Germany.
 Krause was a three-time Olympic gold medalist and eight-time world record holder.
 At the 1980 Summer Olympics in Moscow, Krause won gold medals in the 100 m and 200 m freestyle and in the 4×100 m freestyle relay.
Ambrose "Rowdy" Gaines, IV (born February 17, 1959) is an American former competitive swimmer, U.S. Olympic Hall of Fame member, three-time Olympic gold medalist, and member of the International Swimming Hall of Fame.
 He is the chief fundraiser for USA Swimming as well as a swimming analyst for television networks ESPN and NBC.
 He covered the Beijing 2008 Summer Olympics, the London 2012 Summer Olympics, and the Rio 2016 Summer Olympics.
Sandra Lynn Neilson (born March 20, 1956), also known by her married name Sandy Bell, is an American former competition swimmer, three-time Olympic gold medalist, and former world record-holder.
Sun Yang (; ; born 1 December 1991) is a Chinese Olympic and world-record-holding competitive swimmer.
 In 2012, he became the first Chinese man to win an Olympic gold medal in swimming.
 Sun is the first male swimmer in history to earn Olympic and World Championship gold medals at every freestyle distance from 200 metres to 1500 metres.
 A three-time Olympic gold medalist and nine-time world champion, he is also the most decorated Chinese swimmer in history.
 "NBC Sports" described Sun as "very arguably the greatest freestyle swimmer of all time."
Jacqueline "Jackie" Joyner-Kersee (born March 3, 1962) is an American retired track and field athlete, ranked among the all-time greatest athletes in the heptathlon as well as long jump.
 She won three gold, one silver, and two bronze Olympic medals, in those two events at four different Olympic Games. "
Sports Illustrated for Women" magazine voted Joyner-Kersee the Greatest Female Athlete of All-Time.
Steve Fraser was the 1984 Olympic Gold Medalist in Greco-Roman wrestling in the 198 lb weight class.
 A native of Hazel Park, Michigan, Fraser was a Michigan High School Athletic Association (MHSAA) state wrestling champion and later an All-American in wrestling at the University of Michigan.
 Fraser's gold medal was the first Olympic medal in Greco-Roman wrestling followed the next night by Jeff Blatnick who won a second gold medal for the United States Olympic team.
 Fraser has served as coach of the US Greco Roman team since 1997.
 2000 Olympic Gold medalist Rulon Gardner credits Fraser's instruction as a large part of his wrestling success.
 The year Fraser competed the USA won 9 Gold Medals in wrestling, the largest in a single Olympics since 1896.
Alfrederick "Al" Joyner (born January 19, 1960) is an American former athlete and now coach.
 He was born in East St. Louis, Illinois.
 He is the 1984 Olympic gold medalist in the triple jump.
 He was also the husband of three-time Olympic gold medalist and world 100 m and 200 m record holder Florence Griffith Joyner and is the brother of three-time Olympic gold medalist and world heptathlon record holder Jackie Joyner-Kersee.
Michael Steward Heath (born April 9, 1964) is an American former competition swimmer who specialized in freestyle events.
 He is a three-time Olympic gold medalist, and a former world record-holder in two relay swimming events.
 A native of Texas, he won two national collegiate championship competing for the University of Florida.
 During his elite swimming career, Heath won ten medals in major international championships, including seven golds, two silvers and a bronze, spanning the Olympic Games, FINA World Championships, and Pan Pacific Championships.
James Bruce Tomkins, OAM (born 19 August 1965) is an Australian rower, seven-time World Champion and a three-time Olympic gold medalist.
 He is Australia's most awarded oarsman, having made appearances at six Olympic games (for three gold and one bronze medal); eleven World Championships (for seven world titles including one in each of the five sweep oar events); four Rowing World Cups (for two titles) and eighteen state representative King's Cup appearances - the Australian blue riband men's VIII event, (for fifteen victories, ten as stroke).
 Tomkins is one of only five Australian athletes and four rowers worldwide to compete at six Olympics.
Kerri Lee Walsh Jennings (born August 15, 1978) is an American professional beach volleyball player, three-time Olympic gold medalist, and a one-time Olympic bronze medalist.
 She is the beach volleyball career leader in both career victories and career wins as of 2016, with 133 victories and $2,542,635 in winnings.