Oh lovely..
I know you don't know me from a bar of soap but I feel for you.. so so much. Cancer is such a shitty thing to deal with and go through, especially one as aggressive as the one your mother has. I've been away for a year and a half helping my mother deal with her rare and aggressive form of cancer and only just returned home with her to help continue to monitor and deal with it. It's horrible. It's such an awful and helpless feeling knowing they are going to die. Your mother is going to die. It's a fact that can crush the hardest of souls. The one person - if your mum is anything like my own - who has done everything in her power to help you and there is so little you can do for her because there is no fixing these kinds of cancers. And, if she is anything like my mum, she likely won't enjoy depending on you and your brother. She won't want to be a burden. All the pain and all the emotional and mental anguish and strife.. oh, sweetheart. I am so so so sorry. It's awful and I am sending all my good, positive vibes your way along with the biggest internet hug and offering my e-shoulder and ear to you if you need either. Please, above all else, make sure you take care of yourself. I know I continue to struggle with this and my own health has suffered severely because of it. Take what time you need. Be there with her. Be there for your brother. Enjoy what time you all have together. If that means leaving Miz for an extended amount of time - don't even hesitate. Do what you need to do for yourself and your family.
I'll be keeping you all in my thoughts.
All my love to you and yours xx