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Jackie Joyner-Kersee won a gold medal in the long jump at the Seoul Olympics on Septemeber 29, 1988. About an hour later, her sister-in-law, Florence Griffith Joyner (Better known as Flo Jo) broke a world record in a semi final heat of the 200 meters.
For Joyner-Kersee, the win in the long jump was her second gold medal. She had won (and set a world record) the heptathlon five days earlier.
By the end of the day on the 29th sister-law Flo Jo had also won her second gold medal, and in doing so, broke the world record in the 200 meters, twice within an hour and a half.
Even more medals for Florence Joyner
But Florence Joyner wasn’t finished yet. On October 1, running in the third leg of the 4×100 relay, she won her third gold medal of the 1988 Olympics. 40 minutes after that, she anchored the U.S. team in the 4×400 relay. The U.S. broke the world record in the race, but the foursome from the Soviet Union broke it by even more, so Joyner and her teammates had to settle for a silver medal.
When it was all over, the two sisters-in-law probably had to buy an new piece piece of luggage to schlep home the five gold medals and the one silver medal that collected in Seoul at the 1988 Olympics.