When mum moved into her care home I took some photos to put on her walls - dont send originals in case they go missing or get destroyed - make copies and send them in frames with plastic instead of glass. I also put up a couple of her pictures, got a throw for her bed and some cushions for the chair. Mums care home would allow furniture as well - they took the attitude of - if will fit in the room it can go in the room, so I also took a small bedside cabinet and a chest of drawers from her bedroom. My daughter made mum a family tree, which mum never looked at, but it helped the carers, and I brought in a couple of large cuddly toys, which mum disdained, but I caught her talking to!! I also made a montage of pictures to go on the front of her door with her name in bold letters, so that she would recognise it.
Make sure that everything you send is labelled with your dads name and dont send anything irreplaceable or valuable as things in dementia homes tend to do the rounds and sometimes cant be found at all.