My situation is slightly different from yours, as my son lives in a flat 14 miles away, with carer support. I had some serious health problems. I am now 64, receiving my pension, so not eligible for Carers Allowance in any case. I know that there are some benefits which someone can only receive if there is no one claiming CA, but not sure which ones. The helpline will have all the information you need. They made me £50 a week better off some years ago, because of their specialist knowledge (despite DWP saying Iasn't eligible!!!) so I'm always happy to sing their praises. If you don't get through by phone, just email them and they will get back to you the following week with a VERY good reply.