My Dad was diagnosed with kidney cancer last year. He had his kidney removed and was given the all clear. However this wasn't the case. It had infact spread to his lungs and has now been diagnosed with stage 4 metastatic lung/kidney cancer (not sure on correct term) he has 9/10 lumps on his lungs and surgery is no longer an option. 

I know the internet is a scary place to read up on this kind of stuff but can anyone shed any light? I fear the worst but every time I try and talk to him about it I get upset. 

Is there any chance of recovery or is it too far gone and what kind of time frames are we looking at so I can try best to prepare. 

Thank you in advance.