It's tough to answer your question completely since individuals vary and I don't know your father's history---what type of RCC; what stage is his cancer; his age; his overall general health; his attitude; his support structure; and his medical treatment today. However, as a kidney cancer participant/survivor I can offer some recommendations.
First and foremost, find an oncologist that specializes in renal cell carcenoma. We discovered that cancers are not all the same and that not all oncologists understand RCC. You may have already done this but if not please do it immediately. We have been told that RRC is an agressive form of cancer and time is not your friend.
Second, take charge as best you can. This means asking alot of questions and continue to push for answers. In the not too distant past there were not a lot of options for RCC patients especially if it was not found early. However, today there are new treatments and drugs that have had wonderful results. Nexavar from Bayer is one and Sutent by Pfizer is another. I myself used Sutent and have had unbelieveable results. There are many success stories on the Message Board under Renal or Kidney (mine included). One common point through all of these success stories is that the patient took an active role. I have also talked to some who were told by doctors that there was nothing to be done---not true.
You've probably gathered by now that I'm not the type of person just to sit back and wait. When I first learned of my cancer I took the attitude---Hope for the Best but Plan for the Worse. All of my comments so far are under the grouping "hope for the best". My belief is to take charge. For the other part "plan for the worse", I have some opinions but not much experience. I believe hospice can relate to you what happens in many cases. How your dad responds may differ. Personally, I would cherish every moment; use appropriate humor to lighten the atmosphere; and depend on friends/family for suport. Certainly be open with your fathr and encourage him to do the same.
Please keep in mind though that there are new options today. If I had gotten RCC two years ago I probably would not be writing you today.
Please don't hestitate to contact me again if you have additional questions and find my ramblings valuable.
Good luck to you and your father.