I'm so sorry to hear this.
It seems that the reward for living a healthy life and not dying of heart disease or stroke is cancer.
At least that's what occurred to me when my father was diagnosed with stage 4 prostate cancer back in 2001.
At the time his prognosis was tens years, then - ? metastisis into his bones?
I wouldn't wish that on anyone. Others are, thankfully, more fortunate.
But I am also happy for you.
Your grief shows that you have had the blessings in your life that a loving mother can provide.
You are a lucky man.
There are people who never get to know what you have had.
I wish you and your family a peaceful transition into whatever fate brings into, or takes out of, your lives.
Remember, whatever blessings you have received are yours to pass on.
I am sure you have already been living your life this way in grace.