Cancer can take over your mindset, it can take away all wants to continue, it can and does alter your everyday activities. I know 1st hand what it does to you and those around you, it can be more of a burden/issue to those around the cancer patient than the cancer patient. Recognize that the changes are not meant to be a negative, but a sign of feeling unable to alter or fix the issue.
I found that the treatments were much easier then I had heard, it was a major point that my cancer was found in early stages. Although I am done with the major treatments of radiation I still am under treatments of 6 month shots that cost 5 grand a pop (4 in total,I'm on the last 1 in July).
Many,many people get through it and not only survive, but actually go back to normal, save for some issues like losing a bit of hair, I say it that way because, well it's the mindset. It was prostate cancer for me as well. There are a few places to get some "mental wellness" in your area, check out Zero Prostate they have chapters around the country and can put you in contact, if you feel you need it or anyone else. I did not do that, Mary and close friends gave me my support. The Cancer Center will provide assistance as well, don't be afraid to speak up if needed, on anything at all.
I can say this, stay as close to normal routine, keep the mind in a positive place, if tempers arise (and they will) work through them in a positive way.
Cancer does 1 good thing, it makes you realize what's around you can be gone in a simple snap, so it can make you so appreciate everyday, mundane chores, even chores you have disliked in the past (for me going to the dentist).
God Bless your father in law and his family and his new upcoming family, stay strong and be a person that can take the sometimes yells, sometimes tears as he makes it through his treatments. Power to you and all around you.
