The devout Catholics were known for giving people sound advice and helping others, even letting people in need stay in an old family property on the farm to give them time to get back on their feet, Mr Kubala said.
"He encouraged me to have a go," Mr Kubala said of his father supporting him to buy his business, Southland Seed and Grain.
"Dad was a very great one at what I suppose the Maoris would call 'mana'. People would come to him for advice, he had very good wisdom and could talk to people. He was great for ideas and people would often take his ideas and run with it, which made him happy."
His father "treated people with respect and made them feel good about themselves", while his mother "would always back him up with her nice, quiet, very sincere way".
"Mum was such a loving, kind, supportive person, and she would give to the last degree and more."
The couple met at a dance in their mid-20s when Margaret moved from "a big city job" in Wellington to Invercargill to look after a sick parent.
They were married for more than 50 years, and "could not leave the farm".
"Most people thought they should get into town, go to a rest home, [but] they just wanted to stay on the farm," he said.
"It was their home and it was sentimental to them."
It wasn't usual for Cyril and Margaret to go on a Sunday drive, Mr Kubala said, as they would often have visitors because they "loved company".
However, they set off from the farm around 4pm on Sunday, and never returned.
"When they went for a drive they would never go very far, but for some unknown reason they tackled an extremely hard road, which was way too long a distance for them, and disaster happened," he said.
"It was a pretty shocking one, to the core."
It was not yet known what had caused the crash, he said.
However, the family were "doing very well, considering", Mr Kubala said.
One of the positive aspects was knowing their mentally disabled daughter Nicola was well looked after, he said, as she had recently been moved into a care home where she had settled in extremely well.
"The love and care they gave to Nicola was incredible. They looked after her right to the end. It was lovely.
"They had worried for many years what to do with Nicola because they were getting older, but three or four months ago it all fell into place. Now she's in a great home care, really well looked after, in Dunedin. She really enjoys it, it's been great."
A funeral will be held at Gore Catholic Church on Friday, and will be "open to everybody".
The mass will be said by Mrs Kubala's brother Father Pat Maloney.
