As Rich suggested, push for a PET scan. It was how my cancer was discovered.
I was admitted to Monash with an autoimmune disease. I had CAP scans, MRI's, you name it. It was the PET scan that picked up my cancer at its onset. God knows where I would be now without it.
Even though I have private health cover, my haematologist wrote the referral and the scan was bulk billed. It only took a week to get an appointment.
They inject you with a radioactive isotope and leave you to lay quietly on a bed for an hour before they run the scan. The isotopes are attracted to, and attach themselves to abnormal cells in your body, and the scan picks up the clusters.
Try for a second opinion from another doctor. Maybe they will refer your father for a Pet scan.
I hope things improve for your family soon.
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