I am so sorry - sending my prayers as well.
I have a young friend, with a wife and 2 young children, that is going through his 5th round of chemo/radiation - they kill it and it comes back somewhere else in his body. He says this is the last fight he has in him - I can't imagine how hard it would be and what strength it would take your mom to make such a decision let alone someone in their 30's.
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Going to church doesn't make you a christian any more that standing in your garage makes you a car.