Prayer sweet prayer

Well, my grandmother has been fighting lung infections for months now. I told her the other day that something was wrong and she needed to get it checked out. This morning they went to FS, to the doc and had a tumor removed from her lung. Well, I just received the call and she has full blown lung cancer. My aunt is up there with them and said that my grandpa had broke down on her, and that granny-great doesn't know just yet. They haven't told her, and we don't know what to say. She had not told anyone about the tumor, except me. I had to keep it quite till she was ready to tell them.
Granny is the life to my kids. They cry to go up there, they love her so much. How am I supposed to tell them? I have never had to explain something to them before, not like this. Granny is NOT in good health and is only 90 pounds. I am scared that things won't go well, and how do I explain that? So I am asking you all to pray, cause I know that prayer can and will change things.
Dear Lord,
I pray that you heal granny-greats body dear Lord. If it is her time dear Lord, I pray that you give us and the rest of the family the guidance, love and comfort that you can. Dear Lord, I pray that if granny is to come and meet you during this time, please make sure that her life is with you. That she knows your glory and that you died for her sins. Dear Lord, I pray that the rift between the family will close, and will allow us to fight this battle together, rather than apart. Thank you Lord for your love and I pray that we have the understanding in the next couple of months, days and years...not our will, but thine will be done!!