After being hospitalised with a chest infection in March, John's loved ones revealed that the singer had made a "full recovery" in early May.
"We're pleased to say that John made a full recovery from a recent chest infection in late March which required hospitalisation. He is now comfortable and continues to receive ongoing treatment and rehabilitation care," his devoted wife, and loving sons Rob and James wrote.
"The family would like to re-iterate their appreciation and deepest respect for all the medical staff that has attended to John over the past eight months and the many thousands of kind messages that (have) been received from across Australia and the world."
Just days later, John's sons Robert and James made a shock appearance on Sunrise, referring to their dad as a "fighter."
"It's a fairly long road, as cancer is, but he is doing well and we get to spend a lot of time with him and his spirits are up so that is all we can ask for," Robert said.
"We are just proud of him...he's definitely a fighter."
"Cancer is a horrible thing but he's got great support - the hospitals have been amazing, the staff are amazing, and shout out to those guys.
"It's all about remaining focused and uplifting yourself...He (inspires) us."
WATCH BELOW: John Farnham performs You're the Voice. Article continues after video.
The news comes almost eight months after the 73-year-old underwent a marathon 12-hour jaw surgery to remove a tumour located in his mouth.
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The surgery, which was carried out by 26 medical staff, also saw a major part of the You're The Voice singer's jaw removed, leading to doubts that he would ever perform again and a long stretch of time recovering in a rehabilitation facility.
After the surgery Jill released a heartfelt statement thanking the hospital staff for their incredible work and expressing gratitude to the countless fans that offered their support.
“We are genuinely overwhelmed by the incredible wave of support, love and messages we have received today from so many people around Australia. This means so much to us as a family. Thank you to everyone for this. John will be blown away,” she said.
“We are in awe of the incredible teams of health care professionals who have guided us through this very challenging time with such compassion. All of you undertook this big job today and have given us a magnificent outcome. To all the surgeons, doctors, nurses and consultants — thank you one and all so very much.”
John’s fans have banneded together at this difficult time to offer as much support as they can to the family. Even if it’s just a few kindly words sent through the website weloveyoujohn.com.au.
Announcing his shock cancer diagnosis just days prior to his surgery, John lifted the lid on his condition.
"Cancer diagnosis is something that so many people face every single day, and countless others have walked this path before me," John wrote.
"The one thing I know for sure is that we have the very best specialist healthcare professionals in Victoria, and we can all be grateful for that. I know I am."