LOL at DSIL's theory, MI! But seriously though, that is shit. My cousin gave up her job to go and look after her DDad after her Mum died. Social Services thought he would be fine on his own (he had heart problems and Alzheimers and clearly wasn't). 
This is the man who was found wandering in Bromley shopping centre on his own, with no idea what he was doing there, and another time, miles from home in his car, driving erratically, no idea where he was going and why.
Agree with Molly - when my Mum was ill and in hospital, I was called by the nurse to demand that I be at hers when she was let out, as she would need looking after "for at least a week." I wasn't even living in the country at the time. I did come back, but they kept dithering about when they were going to let her out, I turned up and she was still in bloody hospital, miles from where she lived, and I had no key.