Hi sorry to hear this diagnosis.
I lost my dad to stage 4 colon cancer 28 years ago and know the feeling. He was 66 when he passed.
I will say today there are better treatments than 28 years ago where he received standard chemotherapy treatments. These extended his life only 9 months!
What I will advise you and any siblings you may have is to get colonoscopies if you haven’t already. My brother and I have been getting them since our father had this diagnosis.
Sloan Kettering advised us to start right away. I was 40 at the time.
Nowadays many are being diagnosed with this preventable cancer much younger.