word of warning on this - i did caring for BOTH my parents. My dad is infirm, has an extremely weak heart, diabetes, is on 27 tablets a day and has no power in his shoulders and a raft of other physical issues. My mother was diagnosed with terminal cancer. I applied to be carer for both and has all the medical records and doctor's forms stating that they both needed help.
I only got passed for my mother, they didn't agree my father needed help even though the doctor did. The impression I got was they were cutting down on the amount of people they accepted. I still do caring for my father but unpaid. So make sure you factor in whether you will be approved or not before you make any decisions