Okiegal. I wish there was some way of helping you deal with this, but coming from someone who has been there also I know there are no words.
Please remember to give you mother as much help as you can, but not more than she asks for. My mother wanted to help dad almost all by herself. She felt that if she watched him and paid close attention that she could some how beat cancer.It fiscally
and mentally took its toll on her. When dad passed she was very quiet. She did everything she had to for the funeral, and her children. But mostly she wanted to be alone to grieve.
Be there for her, but remember she wants to be by his side as long as she can, and won't be able to split her time between you and your father. Try to help the others understand if she seems angry, or makes them feel somewhat unwanted. She still loves you, but she feels she needs to be with him right now.
It's so wonderful to see such a strong love for your father from both you and your mother. Your family and you will be in our prayers.
Mark.