Sorry to hear about your father.
If he has prostate cancer, he will be offered hormone therapy to suppress Testosterone. This stops the cancer growing, and usually shrinks it, so it can relieve the discomfort. It's unlikely his plumbing problems are due to the cancer - it rarely causes such symptoms. Those are caused by enlarged prostate which is nothing to do with cancer. Hormone therapy may also help with the enlarged prostate symptoms, as it tends to shrink the prostate too. The bumpy prostate could be cancer, as could pain in bones. There's not much you can do until you get the test results, and waiting for these results is a worrying time.