Re your father's attitude. I think it's pretty common. Until about 3/4yrs ago my dad did practically NOTHING to help my mum, got annoyed when she fell asleep uncontrolably, did things 'too slowly' for his liking, irritated when her hands started shaking while holding her cup and saucer, and still expected her to do everything around the house. (this was before she got her homehelps/great parkinsons nurser, physio etc etc sorted). He would 'reluctantly' take her to appointments and other places but generally carried onlife as normal.
Then he 'suddenly' realised that lots of mum's "annoying" qualities were because of the Parkinson's - not because she was trying to be awkward and went into 'over protective' stage. He tried to do EVERYTHING for her, not letting her at least try to do stuff (started off partly because she was 'too slow'). When she started to get a stoop, and her new Parkinson's nurser started to arrange 'aids' to help her with stuff at home (a bar for the toilet so she could get up on her own, a little gadget for doing buttons up etc), it slowly dawned on him that she DID need help, but that she could also have some 'independence' to go with it.
Now he does all the cooking (the home helps prepare the meals - but don't cook them), and is (reasonably) happy to push her in the wheelchair (again provided after seeing the Parkinson's Nurse) places, he's not 'entirely' happy with her going out for a walk on her own on the 'good' days but does now let her.
I think for my dad is was a mixture of 'denial' and 'annoyance' at the inconviniences that PD brings.