Hi

I've just joined as I think I'm going to need help and I'm not sure where to go. 
My dad has lung, bone and prostate cancer and is really not doing very well and I am now facing up to the fact he's not going to be here much longer. 
My relationship with my dad has been full of resentment since he left us when I was in my mid teens (30+ years ago) and moved in with someone else and her son.  I've gone through periods of hating him and periods of us getting on really well. His partner is quite difficult to get on with at times. I know it sounds awful but I just don't know how I'm going to feel and I don't know how to be around him now. I live 100 miles away so haven't visited since February. 
I am really concerned about how to deal with the fast approaching end and the aftermath and feel I need to talk to someone about it but I have no idea where to find this kind of support. If anyone can point me in the right direction be really grateful