Every year more than 3700 families benefit from the work of the Ronald McDonald House Charities.
As well as the Rotorua retreat, the charity runs houses in Auckland, Christchurch and Wellington which offer accommodation while families are in hospital.
The annual appeal plays a huge part in helping keep these houses open, the charity's chief executive Wayne Howett said.
The Ronald McDonald Annual Appeal started on Monday and runs until Sunday . The annual street appeal is on today. "The whole idea is to raise an extra $200,000 a year. The number of families we support continues to go up and up," Howett said.
"Right now there are more than 120 families staying with us. These donations help those families stay together."
Their son was diagnosed with stage four neuroblastoma and faced months of intensive treatment.
Over the next two years, the family split their time between their home in Reporoa and the house in Auckland.
Scott said the family had spent 242 nights in the house, and counting, as Caleb still had to go to hospital every three months for check ups.
"We don't know what we would have done without them. I remember the first day there they were welcoming from the word go. They found a room for us and we've become family," he said.
Rachael said being able to stay at the house took the pressure off.
"The generosity is truly overwhelming," she said.
Scott said the house was also a chance for the whole family to be together, including with Caleb's brother Izak, 5.
"We'd have all of us together and it was nice to have that normality in the middle of what would have been a s*** situation."
The Kupa family wanted to encourage people to support the Ronald McDonald House Charities.
"Nobody knows what's around the corner. It can happen to anybody. I would never have imagined we'd end up there." Rachael said.
How to donate: - To donate $3, text TOGETHER to 4483. - Online at rmhc.org.nz/donate. - Street appeal: Show your support for RMHC by donating coins to street collectors in blue bibs on May 11.