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At 16 years old, Grant famously won both the Australian Junior and Open Iron Man Championship on the same day.
He later competed in the Summer Olympics, where he won a bronze medal.
Family ties: The model, 27, gushed about Grant s skills as a surfer and kayaker on Instagram earlier this week. Pictured: Jett with his parents, Lisa Curry and Grant Kenny, in June 2000
Inspiration: He made the comment after the popular account Brown Cardigan posted a video of an enthusiastic paddle boarder along with the caption: Settle down Grant Kenny
Jett has followed in his father s footsteps by competing in Ironman tournaments, too.