My Dad is pretty severely disabled, he can just about move around with a zimmer in the house, but can't go out himself, and can't get out of bed on his own, struggles in the showers etc. Due to the nature of his illness he is in constant pain and his back has deformed into an extremely pronounced hunch, meaning he can't move his head. His disabilities are only physical not mental, although is a bit befuddled by medication sometimes.
Anyway, my Mum is his carer but is struggling with depression at the moment and takes it out on him. She is always very short and snappy with him, and IMO is often extremely unfair in the way she treats him (emtionally never physically) and is pretty much always shouting at him.
I try to referee but I'm not always there. But after a particularly childish reaction from my Mum following my Dad asking something, I was having a mini-rant and he said
'Its ok, I don't bleed from it, I'm alright'
It was just the resignedness of those words that broke my heart, and I feel so helpless to help either of them.