Even first-time Olympian Max Esposito thinks the parallels between his modern pentathlon performance and his sister's efforts are "freaky".
The 19-year-old finished seventh in Rio - the same mark his Rio gold medal-winning sibling claimed in London.
Esposito also went into the final round with a 45-second handicap, the same mark Chloe Esposito stormed home from to win gold on Friday night.
And Chloe struggled with her fencing in 2012, just as Max did, ultimately leaving him just six seconds from claiming a bronze medal on Saturday.
"My fencing is always up and down, up and down like a rollercoaster," Esposito said after the race.
Australians will be hoping the next parallel is Esposito winning gold in Tokyo 2020.
He finished 29th in the fencing but placed in the top four in every other event.
Esposito swam the fourth-fastest 200 metres, and scored the maximum possible points in the equestrian section, to sit 17th overall.
Esposito was on the verge of fourth overall at one point in the combined running and shooting event, but a mixed final shooting performance cut valuable seconds from his chase.
"I was really happy with my running, the shooting I thought I could have done better, but I think a little bit of the crowd and people (distracted me)," he said.
Esposito said finishing seventh against athletes he watched as a 15-year-old in London was "unbelievable".
"In my head I said `I want to get top 10' but I didn't tell anyone because I didn't want to jinx myself," he said.
The Espositos are trained by their father Daniel - himself a former Olympian - and are known for their commitment.
"We've got a reputation from all the pentathletes that we are psycho trainers," he said.
"Well, today coming here and showing that we can get a good result by Chloe getting gold and me getting seventh, shows hard training pays off."
Russia's Alexander Lesun won gold despite finishing 20th or worse in all the events bar the fencing, which he won.
The Ukraine's Pavlo Tymoshchenko won silver and Mexico's Ismael Hernandez Uscanga won bronze, just six seconds ahead of Esposito.
So will Australians see Esposito in Tokyo?
"One hundred per cent. I can't wait," Esposito said.