My grandad has just recently been diagnosed with stage 4 lung cancer, and I have no idea how to help. He is 84, which I know is still a good age, but I'm terrified. My mum has taken on full carer to ensure he is comfortable but I don't know how I am supposed to help. 

I don't want to make him change everything he used to do, like going shopping by himself, taking himself down do the laundry room in his complex, and just daily things he would normally do.

I've been told by family members to try help my mum, not only with my grandad but ensuring she doesn't do too much and become ill, but I don't know how I'm supposed to help anyone at the moment. 

I'm hoping by making this post, I can have some advice on how to help them.