From the outside looking in, Kate Langbroek's decision to move her family of six halfway around the world to Italy may have seemed a crazy one.

First of all, moving four children - including teenagers - anywhere is not easy. Let alone to a whole new country, with an entirely new language and culture. Then there was her job as a radio host with Dave Hughes - the kind of dream media job you stay in for life. But for Langbroek and her husband Peter Allen Lewis, it all made sense.

Listen: Kate Langbroek talks to Mia Freedman on No Filter. Post continues below audio.

Langbroek grew up as a Jehovah's Witness and moved around a lot with her migrant parents. She was used to being an 'outsider'.

"I realised in retrospect that was formative for me to have gone to different places and to meet different people and to have had to start a new, not that it was easy," Langbroek toldMamamia'sNo Filterpodcast.

"But if I then look at life, anything that I've ever done that's been worthwhile has not been easy. Nothing.

"I would say to Peter all the time, because it was such a sh*t show trying to get there, with visas and blah, blah, and schools, and there's six in our family. So anything we do, it's complicated, and Italy is also a complicated place... I'd go 'People do it all the time. It's totally possible, people do it all the time'. And then one day, Peter said to me, 'Darlin', who do you know, that's actually done it?' was like, 'Oh'.

"I think I thought people do it all the time. But people actually don't do it all the time."

The decision to up sticks came a few years after Langbroek went public about their now 18-year-old son Lewis' three-and-a-half-year journey with cancer.

Lewis was six when he was diagnosed with T-cell acute lymphoblastic leukaemia in 2009.

Langbroek and Lewis had three other children under six, including their youngest son Jan, who was just a few months old. For three-and-a-half years, hospitals and doctors became the family's new normal.

For most of the time, Langbroek continued to work on her radio show with Hughesy. She would turn up to work and make people laugh, even while going through the darkest of times.

"There still was a lot of funny stuff in life. There still was, and there had to be. Not cancer, obviously," she recalled of that time.

"One of the things that they said to us at the hospital when Lewis was first diagnosed - it sounded impossible - they said 'You have to live a normal life'. Louis was diagnosed in the December and so we had that entire eight weeks or whatever before there was even a question of going back to work.

"And the doctors and nurses were like, 'You have to go back to work, you have to live a normal life'. And we were like, 'What? How?' Nothing felt like it could ever be normal again. And then one of our doctors said to us, 'If you don't live a normal life, what are you telling your child? And what are you telling your other children?' Who would ever have thought of it from that point of view? So that's what we endeavoured to do."

So within that time, Langbroek's work became a 'gift' to her.

"Work is a salvation. It really is, and so [it] became a place for me where I would have three hours, very early hours, that weren't about cancer. So it was good for me as well. And then, you know, sometimes Hughesy would come into the hospital straight after work or [the pair's long-time producer Sacha French] would come in, so it sort of blended into our world. When Lewis was down we were all down. And when Lewis was up, we were all up."

On August 8, 2013, after more than three years of keeping it quiet, Langbroek told her listeners about what had been going on.

"It was on his birthday," Langbroek explained. "He had finished treatment. So he finished treatment around Easter. And his birthday is in August... and I said to Sacha and Hughesy, 'I think I have to talk about Lewis' and Hughesy was like, 'Ah, okay'. Because they were always like, 'Well, whenever you're ready to share it'.

"For a long time I held it because it was also not my story. It was Lewis' story. But I went, 'I'm going to do it'... I think I called Peter and I said, 'I think I'm going to talk about Lewis'. 'Alright darling,' he said, 'I hope you don't mind if I don't listen.'"

Lewis is still monitored regularly, but he has been cancer-free since 2013.

"We all have a cloud over us," Langbroek explained. "And most of us just don't know what that cloud is. With Lewis, we know what the cloud is."