still hope?

I know people say there is always hope and deep down I believe that but am having trouble since we got the news that Dad's cancer has spread to his hip and there is now no chance of surgery. I'm not real sure why that is--I guess because of spreading more? Dad is having 35 radiation treatments to his chest (for 1 lung tumor and 3 chest lymph nodes) and 13 treatments to his hip. He has 18 left to go on the chest and 7 left to the hip. Chemo hasn't started yet. Once cancer goes to the bone, can it be stopped?? The doctor said the bone scan only showed it in the hip. When we heard they were just doing 13 treatments to the hip, we thought this might mean the cancer wasn't real bad there but then a friend who is a nurse said it might mean that's all they plan to do. My Dad will not let my Mom or me go to his doctor appts with him because he doesn't like for us to ask the doctor a bunch of questions because he thinks it's embarrassing. He won't ask hardly any questions either. I think maybe he doesn't want to know and I can understand this because I can't imagine what he is going through right now. It's just hard to have all these questions and know that you can't get them answered. I love and respect my Dad very much and don't want to make him mad but the not knowing is driving me crazy. Anyone out there know of anyone where their lung cancer went to the hip? Does this now mean stage 4 and no hope? Sorry for all the questions but I am at a loss. Thanks for listening. Donna