Michael Gilbert (19) won this year's Canterbury A&P Show's junior dairy stock judging, earning him a trip to Australia to compete in the junior judging at the Sydney Royal Easter Show next year.
Luke won the same prize last year.
''It means I get to go again ... the whole family came to support me,'' Luke said.
Luke was the youngest competitor of 13 in the Sydney junior judging competition and was placed third.
''It was awesome.''
He said it was a great learning experience and he had the chance to judge some unfamiliar cattle such as the Australian Illawarra shorthorn.
Luke's family runs the Glenalla Jersey cattle stud, at Winchmore, inland from Ashburton and he boards at St Andrew's College in Christchurch.
He is the fourth generation of his family to be involved with Jersey cattle. His great-great-grandfather Thomas Gilbert began milking cows at Leeston in 1900.
And his great-grandfather, Reg Gilbert, started up the Glenalla stud at Leeston in the 1920s.
His father, Peter, and grandfather, Thomas (Ivie) Gilbert, moved to the present farm at Winchmore in 1988 and restarted the stud there.
Luke's skills as a judge have already been recognised nationally and, despite being a Jersey cattle breeder, he has been appointed Holstein Friesian associate judge.
He was first tested in his official capacity at the North Otago A&P show, in Oamaru, earlier this year, and believes he will ''make history'' next year.
Both he and his father have been invited back to the show to judge - he will judge Holstein Friesians and his father will judge Jersey cattle, possibly a first father and son dairy cattle judging team at the show, he said.