The 5-year-old was diagnosed with soft-tissue cancer that had spread to his lungs and various bone sites earlier this year, which meant months of radiation and chemotherapy treatment lay ahead for him.
On Friday, the Beatons were told his primary tumour was no longer visible and the operation to remove it, which was to take place at the weekend, was no longer needed.
Angus had been wishing to his mother and father, Fritha and Gordon Beaton, of Arrowtown, that on Daffodil Day he was going to pretend to be a "normal kid".
"I felt sick in the morning because I knew it was going to go either way. We were either going to have a great day or a very bad one."
Although the news did not come as a complete surprise to his mother, as the tumour had been shrinking, she said a visit to the doctor was always an edgy experience and she never let her optimism get ahead of her.
"You almost don't let yourself go there until you see it. I find all these milestones really nerve-racking." At the beginning of April, the family was facing months of treatment.
Now, Mrs Beaton said she could see the light at the end of the tunnel and the treatment process was getting down to weeks.
"I feel like we are on the other side of it now. I never try to look too far ahead."
Angus will begin his five-week chemotherapy cycle on Friday and his eight-week radiation treatment by the end of next week.
Mr Beaton said this would be a gruelling few months for the family and Angus because the treatment would fatigue their son and the radiation treatment to his lungs was still high-risk.
The family celebrated the good news by spending the weekend in Akaroa, away from their temporary Papanui, Christchurch, home.
"He's looking so good, resting on the beach and jumping around in the water."
Mrs Beaton said they planned to be home by Christmas to celebrate with her father and Angus' granddad in Arrowtown.
Meanwhile, Angus' sister Kate (6) is attending Waimairi Primary School until her brother is fully recovered and the family ready to come home for good.
