I lost my own dad at age 59 from cancer.
He was too young to admit he was dying and denied it to his last breath.
It will have been 5 years come April.
My heart goes out to you as someone who can, to some degree, relate.
One passage that really helped me I would like to share with you.
If a man dies, can he live again?
I will wait all the days of my compulsory service
Until my relief comes.
You will call, and I will answer you.
You will long (or "yearn.") for the work of your hands.
- Job 14:14,15
Job knew that God would yearn for him to live again.
Why would he not feel that same way about your dad?
"And I have hope toward God, which hope these men also look forward to, that there is going to be a resurrection of both the righteous and the unrighteous." - Acts 24:15