Oh believe me I know exactly how you are feeling. Mum was just the same over 6 years, to start with she used to sit by the bed everyday waiting with her suit case ready to come home. The Care Home Manageress was so good she even took Mum to her old home locally and the two of them sat outside in the car and Mum said to her, why are we here.
The Manageress said dont you recognise the house and Mum said No, this isnt where Mum and Dad live. So they went back to the Care Home. Mum who was an extremely frail lady got worse as time went on, they did not at any time say that she could not stay which was marvellous , although I will say she was self funding and as such she was paying twice as much as anyone else there that wasnt. We had several episodes , Mum went into the garden where previously a gazebo had been erected and the poles were lying on the grass, Mum picked up one of these poles and lobbed it through the lounge window of the Home. How she didnt kill anyone I dont know.
We also had an episode of throwing everything that wasnt nailed down out of the room she had. Everything went including the TV, she may have been frail but she could be as strong as an Ox.
She trailed one day round the Home swinging her handbag which unbeknown to anyone else there was a whole bottle of Port in it. She swung this bag at everyone injuring a few inmates as I called them. When the staff took the bag away they were shocked to find this bottle of port inside.
I tell you fun and game have just begun. Lunches were fun, Cook used to tell us that she and her staff were used to ducking as things would come flying back through the serving area to them. On one occasion Mum threw her plate of soup like a frizzbee into the kitchen.
One of the staff took her for a walk along the road one day and it became very overcast and it was obviously going to pour with rain so she said to Mum , we will have to go back. With that Mum started screaming at the top of her voice I have been kidnapped and the neighbours came out and wondered what was going on. Conveniently a police car came past and stopped and the staff member explained and the officer put Mum in the back of the car, (she got in the car and went like nothing had happened all innocent like) and they took her back to the Home.
Dont feel guilty. It is an illness, you are the one that will suffer more than your Dad, although it may be not feel like it. God bless you.