The Espositos were the first Australians selected to go to Rio de Janeiro, and Chloe was the final Australian to deliver a gold medal at the 2016 Olympic Games.
Neither Esposito was particularly heralded coming into the Olympics, with Chloe more credentialled than her brother Max but thought of as a minor medal chance at best.
She thought a bit differently.
"After I crossed the line [first in the Hungarian championships], I just had this gut feeling and I thought 'I think it's going to happen'," Esposito said.
Chloe went into the final combined running and shooting event in Rio with a 45-second handicap, but she picked off her competitors one-by-one to lead after the final shooting round.
"Finally I heard that [the other competitors] had left the shooting range and I looked back and I saw that it was quite a big distance," Esposito said.
"And I know I can run and I knew they wouldn't catch me in the last lap."
Chloe finished seventh in London but moved to Budapest two years ago to improve her fencing, and it paid off as she was able to climb up the rankings in Rio.
Max, the youngest competitor in the men's event at 19, finished seventh in Rio, hampered by a poor fencing round - as happened to his sister at London 2012.
But his strong showing in every other event leaves him in no doubt that he will be back as a force in Tokyo 2020.
Both athletes talked about their training -- they only recently finished a high-altitude camp in Mexico -- and said their father and coach, Daniel Esposito, had lifted them to these heights.
"We've got a reputation from all the pentathletes that we are psycho trainers," Max said.
"Coming here and showing that we can get a good result by Chloe getting gold and me getting seventh, shows hard training pays off."