Depending what the illness is, yes memory can be affected. And I don't know how old your T is but with older people in general sometimes they are in denial about their loss of memory, hearing, etc. I know people who still won't wear a hearing aid even though their hearing is almost gone. It is a sad situation but if they don't remember what you said, you are right that is not being helpful. If you do terminate, you can know you are doing the right thing for you. It is not that you don't care about the T and you can tell them how much you care. But this a professional you are paying for their services and you are the consumer, you need to get the highest quality of service for yourself. I know it sounds detached but it's true isn't it?