Carers Allowance is badly named. Its given to the 'ill' person not the person who is doing the actual 'caring'.
So both his parents should request it and it'll be paid into their bank accounts, not his. The idea is that it's paid to the person needing the care to enable them to afford to pay someone to look after them. They can spend it on , say, a gardener, someone to put grab rails in the shower, a nurse, or someone to get them up and dressed in a morning, they could also spend it on riotous living, no-one checks. To my mind its a stupid allowance.
In my experience Social Services aren't much help, they are more enthusiastic about bullying the family to take all responsibility.
I found AgeUK the most helpful, especially with filling in complicated forms so please try to get him to go to them - and perhaps go with him so they are sure to get the full story?
Last letters become first - March 26
What were your dream names for your kids when you were growing up?


