Why can it be difficult to decide whether or not a person is an informal carer and does it matter?

It is important to be able to say who is and who is not an informal carer, if help and support are to be offered to them. This can be difficult as many people who care for their relatives and friends do not see themselves as carers. This is true of my grandfather in law Mr M. He is a gentlemen of 86 years of age and he lives with his wife Mrs M who is 84 years old. They live in a small two bedroom bungalow in a rural area. Mrs M is registered partially sighted, she has suffered a stroke and also has arthritis which causes mobility problems….(short extract)