My dad diagnosed with GBM grade 4 in 2016. Until now already done 3 surgeries to remove the tumor. At one time he said he just want to wait until my brother (currently 18 years old) to finish his study & get his first grandchild then he will stop surgery and wait until his final moments.

I can imagine his suffer. In 2 years time already done 3 major surgeries. And its very painful because it is related to brain.

The doctor said the only thing that can overcome the suffer of cancer patient is morale support. So yeah, give your support to them. Also to their families.