The possibility of losing a parent is devastating... My mom and I were very very close and she passed away from lung cancer 11 years ago.. I knew she was terminal from the outset but never gave up hope. What I did do was spend the time with her and enjoy her while I had her. Never give up hope, miracles do happen, there are several people here who have been sent home with no hope and are now NED (no evidence of disease..) drs. Are educated but everyone is an individual and as such their body responds differently. So do what you can to fight this disease, see if there's a clinical trial available - and most importantly spend the time with your dad... It can't hurt and it will make you and him feel good. Hugs!