I'm so sorry to hear about your Dad.  It's so hard to understand i treatment but maybe I can help a little.  My husband was diagnosed aged 70 with incurable lung cancer but he was fit enough to have chemotherapy and radiotherapy, except when his blood were not good enough.  So you have to understand that even with cancer you need to have a level of fitness to cope with treatment, this is why bloods are done every three weeks before any treatment.  So when he was not fit enough to have his immunotherapy all treatment was stopped and its then a case of palliative care to keep that person comfortable and not in pain.  We can only fight for our loved ones to a certain point and if the treatment is worse than the cure life becomes unbearable.  Just support them both as much as you can and use all the resources offered to help them cope.  Best wishes to you all, Carol 

That's really good news, pleased to hear I have been of help. Carol