Fathers diagnosis

Hi all
My father was diagnosed with stage 4 (metastasis) brain and lung cancer this week. His primary cancer was melanoma.

He has been recommended to receive radiotherapy to elevate his symptoms and try to control it so it wont spread any further.

Im hoping to find anyone with a similar prognosis, they wont express a life expectancy time frame to us.

We were wondering what the point of the treatment is really if it wont get rid of the cancer, why bother? He isnt in pain at the moment. He was such an active intelligent man but now he is bed bound, incontinent, confused and downright angry. To see him this way is quite heartbreaking

Thank you