featherbaby I am so so sorry for your parents nearing their journey. I still have both of my parents, have had some close calls but they are still here. I have lived through the situation you are in with my grandfather, great grandfather and great grandmother. I will tell you a quick story that may be of some help to you...
When I went away to college after taking time off to give birth to my son, I snuck back to my hometown with a u-haul and literally stole the 2 grandfathers and grandmother from my parent's home. I left my daddy a note and said "I have the grandpas and grandma and I am keeping them". I did keep them, I was with the grandpas when they died and I would not trade those times in my life for anything. It was tough. I was single, raised a son alone, working full-time and going to school full-time. But it was great!
The night my great grandfather died I had just come home from work with my son and was getting ready to head to class to take a final exam and he said "I know you have a big law test tonight but can you stay home with me, I want to talk to you" I looked at him and I could see the seriousness written on his face but a softness and love in his eyes. I said "of course grandfather I will stay with you". We talked, mostly him and I listened, until the wee hours of the morning, he insisted I write everything down. All about his childhood, his wife, his children, his wife's death, etc etc." when he was finished talking he walked into my son's room and kissed him as he slept and he hugged me and kissed me. I followed back to his room to make sure he had everything he needed for the night and he said "In the morning you will know what to do but will not want to accept. Remember who you are and my wishes. I have loved you since before you were born and will always be with you but it is time for me to take my journey" I immediately became distraught and he scolded me...reminded me that I was being selfish trying to keep him here...and he gently reminded me that it was a natural thing and it was time. I went to sleep crying and thinking it was a bad dream...the man had never been sick a day in his life...yes he was nearing 105 years old but he behaved like he was 50 most every day. When I awoke, I went to check on him immediately and my grandfather, his son, was singing a prayer song and I knew he was gone. He went to sleep and did not awaken. He wrote a note and left it for me...I still have it in my scrapbook. And it was simple but to the point...
"I love you and shall always be with you. Do not cry; rejoice, celebrate and be happy for me as I move on to my new life. A new journey awaits with those I loved and who passed before me. I will see you smile again, no tears."
At the man's memorial service I could do nothing but smile, remember fond happy memories of growing up with him and of the day I stole him from my father's house. I still miss him 20+ years later but I cannot bring myself to ever shed a tear. He paved the way for me to handle the long illness and death of my grandfather 4 years later.
So, talk to your dad and your mom, often, never forget all of the good and all of the smiles...those are things you will cling to after they are gone. Do not cling to the vision of the sick and dying, cling to the vision of the people you have loved all of your life, through good and bad. Your father hears you no matter what anyone else thinks...his heart hear you, so talk to him. tell him what you feel and how much you love him. Read to him and include him in your every day life by talking to him about the weather, the chickens, the latest silly thing on TV. And remember that he loves you too. All daddys love their little girls.