My best piece of advice is go to a recognized "cancer center of excellence" if that's an option available to you. Google it and you'll easily find one. I did (Mayo Phoenix) and I was very happy I did. I felt the advice and care was outstanding. Also, I'd recommend Dr. Patrick Walsh's Guide to Surviving Prostate Cancer Paperback – October 3, 2023. It's on Amazon and it's the best $20 I ever spent. It really helped educate me on some key points in my decision making. My prostate cancer situation is quite different from your father so I don't have any specific advice for you. Best wishes to you and him.