My siblings are being vicious to me right under my dad's radar. He is accusing me of hating them. How do I get out of this toxic environment?

I am living with my sick 82yr old father all alone. My two sisters literally hate me, and always have even long before dad got sick. They always accused me of being the "favorite" which is somewhat true, especially with my mother who died at the age of 46 on my 26th birthday! I am 52, and they are 50 and 42!!!! Imagine women of this age behaving this way? My mother was the glue of the family keeping things barely together when she was alive. After she passed they came at me with a vengeance. Over the years I tried everything I could to try to win their love, but no matter what I tried it was never enough. They both called me when they needed my creative help. I am an artist, and am multi talented. Everytime they needed me I'd jump thinking it was an opportunity to win them. I am disabled, and was born that way. I can get around, but not without a lot of pain. Through years of therapy I now understand that there will never be that fantasy bond I yearned for all those years, and am just fine with that. When dad passes I will not contact them at all. My door will always be open with love, not service but love should they have an epiphony, but I will not seek it ever again. I now understand that they live in unhappy lives of hell. They almost never come to visit our father, and when they do are chomping at the bit to leave. When we do have to be in each others presence though they are like a mean gang of vicious cheerleaders, even bringing their spouses into the attack. My father wears his rose colored glasses of denial, and their torture goes on right under his nose. I have told him why I go out often when I know they are coming over, but he accuses me of being hateful to them!!!!!!! The one daughter who loves him, and cares for him daily with absolutely no support he blames!!!! I have tried to tell him the truth, even going as far as to take him to one of my therapy appointments, but has gone back to his own beliefs. I, and my therapist have repeatedly tried to get together to work things out if for nothing else but the happiness of my father. My therapist has called each of them four times and requested family meetings, and I have asked at lease six or seven times. We have been met with firm "no's". Still my father blames me of not forgiving them!!!! I have in fact forgiven them, and am able to see them as hurt little girls. My major problem here is that I have been living in a negative toxic environment for five long years now with no real escape. Because there is no one else who would share his care I am stuck in hell here. I have no spouse with me to help either so I am completely alone. I do go out when I can, but know it is only a bandaid, and I'll have to go home to my prison of hatred. Prior to my fathers illness I did not see much of them. I was able to avoid their negative presence, and only surrounded myself with the light of wonderful friends and my horses. I gave up my last horse two years to be here for my father. I gave up my freedom for him, and they both know I would never leave. He has no dementia, and does go out when he feels well. The nature of his illness is not that of a bed ridden dying man even though he is dying...slowly. He cannot however do any shopping, cleaning or cooking, and has frequent falls, bleeds from dialysis and has mini heart attacks and mini strokes. I have to call 911 at least once every two months. His Dr. said he's like a house of cards, and the least little thing could kill him at any time. He has come close to dying several times from different things, and has already way outlived what his Dr.'s expected with his numerous fatal diseases. How do I deal with this situation which is making me age rapidly, and physically and emotionally very sick? Even the one person who I never thought would turn on me, my father, has. I just want to leave, and see how the two selfish grudge holders would manage doing my job! Any suggestions? I really do need solutions that do NOT include a nursing home. I would NEVER do it, and he does not need that type of care. Thanks all for reading this loooooooong diatribe! LOVE and LIGHT