Suzy,
I'm very sorry to hear about your future father-in-law. I understand you are hungry for information about prostate cancer, and hopefully I can point you to some reliable resources. As you might already realize, there is a very wide spectrum of case characteristics...from the very serious cases all the way down to the cases which might not even need treatment at all. In fact, some men do successfully treat their "low risk" cases with diet and exercise...but with what we know about his case, it is not "low risk." In fact, with news that it is in the prostate bed area, we already know it would be called "locally advanced", and doctors will be looking for indications whether it is also "distant advanced."
There is a book, available via Amazon (could be shipped today and arrive by Monday), which is considered by most to be the "Bible" of prostate cancer called "Dr Patrick Walsh's Guide to Surviving Prostate Cancer." The book is a very complete reference book, with good sections on advanced prostate cancer (PC).
There are many good online resources, too. The NCCN, the National Comprehensive Cancer Network, publishes the treatment guidelines for doctors. They publish a free online patient version which has good details for someone coming up to speed, in addition to their flowchart for treatment. Go HERE for the PC Guidelines.
I hope that this helps you get started.
best wishes...