I would have to go with the Howards. In the 70s/80s they dominated track and field, went on to win multiple olympic medals and still hold the 4x400 high school recrods.
A short story about them from 1985
In 1979, when Denean was a freshman, Tina was a sophomore, Sherri was a junior and Arta was a senior at San Gorgonio High School in San Bernardino, the girls practiced what their father preached. In their first year as a mile-relay team, the Howard sisters set four national records in four weeks, breaking their own record every weekend for a month until they reached--and won--the state finals.
In 1980, they moved to Granada Hills. While attending Kennedy High, Sherri and Denean finished first and third in the Olympic Trials, earning berths on the U.S. women's 400-meter relay team. Last summer, they both won gold medals in the Olympics. It was the first time two sisters represented the United States on an Olympic track in the same event; naturally, it was also the first time two sisters won gold medals in the same track event.
Sherri and Denean, representing Cal State Los Angeles, will compete today in the Pepsi Invitational track meet at UCLA's Drake Stadium. Denean will run in the 400 and Sherri will run either the 200 or 400.
Eugene, of course, is still their coach.
Last year, Sherri ran an Olympic-record 400-meter relay split: 48.83 seconds. Remarkably, she set the mark while running with two stress fractures in her left foot.
WOmen cant run that healthy now...