The two Dengs dressed sharply for their meeting.
The taller, older Deng Adut is a successful lawyer who has been nominated for Australian of the Year.
And the younger, Deng Akech, is about to start Kindergarten.
They met at the Lyons Early Childhood Centre in Canberra.
Five-year-old Deng and classmates had donated $100 to Deng Adut's charity.
"It's bigger than a million dollar gift, is what I can say so I thank the parents, I thank little Deng here, thanks from big Deng to little Deng that he done a fantastic job and I would encourage him in the future to keep doing exactly what he's doing so far because giving, it's natural, the Australian way. That's what you call a fair go."
Deng Adut shared some of his life's journey to the school children.
Taken from his mother, he was forced to fight in the Sudanese civil war before his older brother, John Mac, helped him to flee to Australia in 1998.
John Mac was killed during a humanitarian mission in Sudan in 2014.
It inspired Deng to set up an education charity in his name.
"He has done a lot for me. He saved my life, he smuggled me out from the war and gave me an opportunity to come to this country and stand on this platform today."
Young Deng Akech's mother Gak Elizabeth also came to Australia from South Sudan.
Her four children were born in Australia and she says Deng Adut's story inspired her son last year.
"When I came to Australia, I was supported by Australians, that's why I'm here. So Deng took that example from people like Deng Adut and other people around the community. We need to give them money so it will have an example in the future."
Deng Adut was awarded the New South Wales Australian of the Year honour last year.
It has made him eligible for the Australian of the Year Honour, with the winnner to be announced in Canberra later this week.
Whether or not he gets that honour, he's happy to keep helping refugees make their own mark in Australia.
"The children should be inspired. They should not be divided in any way. They should not be ethnic. Australia is not ethnic. Australia is Australia, there's one Australia so I'll be preaching that message."
Deng Adut has established his own Western Sydney law firm, which mostly helps refugees and disadvantaged people.
He says he wants to use 2017 as a year to reduce youth imprisonment.
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