Blue8
What your Mum is going through is possibly denial and her way of dealing with her prognosis at this time.I know from my own experience when you are told you have a certain life expectancy,it is a massive shock,we all react differently to this news,I was able to have surgery for PC and I am still here living beyond the medical expectations for me, however still terminal but life is good ups and downs.I am sure it is harder for my family than me as they see how I am going over time, we talk openly about what is happening,so I possibly understand what you are feeling it is normal to feel the way you do, all that you can do is continue the love and support to Mum and Dad a big ask I know. And Look after yourself as well.
And if you or your family need professional help don't be afraid to ask for it we did and it helped but that is a personal decision,I am lucky my Daughter moved back home to help out so if anything happens to me I know my wife will be OK which has taken a huge load off me
thinking of you all good luck with the chemo
kj