Sutent seems to be the first course of action. If your father does not tolerate it well or it doesn't work, they move on to Torisel. As awful and overwhelming as this all feels right now, we all need to be thankful for the recent advances. Neither of these drugs was available a few years ago and now there are options.
My mum was one sutent for ~12 months and is now on Torisel and doing really well 16 months after the diagnosis. I think the thing that is helping her most is making sure she has a life beyond being a cancer patient. She can't do everything she used to (gets tired easily, doesn't want to go anywhere where there are crowds and she may catch a cold, can't travel as she would like because of weekly infusions) but she is still very social and involved in a lot of activities. We try to find the humour in all of this - like when the courses of sutent turned her hair grey followed by a dark stripe for the time she was on break, her hair looked like a racoon tail (you could literally count the number of cycles based on the 'rings' on her head).
Good luck