http://www.bowelcance...-for-bowel-cancer.pdf
That is a link to the official guidelines, I am sure you have those already though. My husband was treated with Chemo following his surgery, so the effects were a bit different.He may well be a proud and private man, but talk plenty and give him the chance to open up, he may well be far more frightened than he is letting on.
Stock up on favourite foods and drinks but his appetite may be diminished, so small portions of his favourites will be good, plenty fluids too.
Plan small but fun things to do at the weekend, to take away the monotony of the weekday visits to hospital, above all talk .
I wish you and Dad all the best, take care.