"He just loved playing with tractors, you know. We grow older but we're still young boys at heart.
All the tractors come from the John Deere collection, with the oldest from 1935.
Also in the auction are stationary motors and other unique farm antiques, such as an icecream maker.
Auctioneer, Alistair Beer said he expected around 500 people to attend the auction, with bidders coming from all over the world.
"This auction in particular is quite unique because it is probably the biggest collection of John Deere tractors in New Zealand, certainly the most impressive with the quality of them," Beer said.
"You will not see this kind of collection of tractors up for sale possibly ever again in New Zealand."
While Neil was well known for his tractor collection, Brent says there was much more to him.
"Life wasn't easy on the farm, there was six of us. Dad worked hard. He got involved in the church, missions, he liked to give back.
"I don't want to portray Dad as someone who just worked on tractors, he had quite a life outside of that as well."
The auction - at 21 Maungakawa Rd, Ngarua - will start at 10am on March 9.
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