Driveway deaths were a growing problem that needed to be dealt with, Mrs Downes said.
She would like to see 4WDs have reverse sensors or cameras fitted and wanted a public awareness campaign about the issue.
"Because Kronos was such a joy, something good has to come out of it. His death can't just be all about tragedy."
Mrs Downes became teary when she remembered Kronos, the little boy who lived with her for his first six months.
"You could have a room full of people in the foulest of moods. He walked through the door and it seemed like he pulled in all that negative energy and just burst out a whole lot of sunshine.
"You couldn't stay mad around him. He had that type of aura around him, his smile was just perfect."
Even when Kronos and his parents moved to the Bay of Islands, Mrs Downes would still see him regularly. She recalls "spoiling him rotten" on his frequent visits to her house, showing him old episodes of children's show Barney.
"In the 18 months he was here he experienced everything life could possibly have to offer. He went to [pre] school. He went to a party and got someone's beer off the table. He's travelled around all of the North Island."
Kronos, affectionately dubbed Simba by his family because of his lion-like cries at birth, died on July 20 last year.
Mrs Downes can still remember the call from her sister, Kronos' mother, who was screaming down the end of the phone as her boy was dying. She raced to Middlemore Hospital, where doctors worked furiously to save Kronos. After some hours she was told her nephew, the boy she thought of as another son, had gone.
"I just collapsed on the ground. My brain literally shut down. I could see people talking but I couldn't really hear it. There was a buzzing noise in my ears. I sat on the ground for 15 to 20 minutes. I closed off into myself."
For a while, Mrs Downes said she was unable to cope with her grief. But after counselling and a trip to Australia, she's learning to deal with it.
"Kronos is now and will forever be missed and loved by all his family."
Mahanga said he was too emotional to talk about what happened.
Kronos Gosney
• Died on July 20 last year, aged 18 months.
• Run over in driveway in South Auckland.
• Great-uncle George Mahanga, 56, has been charged with careless driving causing death. He will defend the charge.
• There have been 30 driveway deaths since 2000.