Yeah, I was sort of hesitant to comment because I really feel where the letter writer is coming from. My mother doesn't have the anger issues, but she's having terrible memory issues, even though tests they've done show nothing unusual. But her response to it is to tell me that I "have" to remember things for her, which... no, honey, I don't. You need to write things down, and check the messages on your answering machine, and put things in your calendar. This is something where it's not inappropriate to ask for help, but you don't get to voluntell people into being your brain.