Welll said Lisa. To be perfectly honest Kathy, my brother died 18 years ago and I have not forgotten about him. Yes, I do miss his anniversary of the day he died, though quite honestly, these days I don't see that as a good thing to remember anyway. Instead of me being happy with the memories I have and do think about often with him, I would be depressed because of a day he died. I wish he was still here, though I have the memories and what is most important, when I think about him and miss him I have a picture of him in my room. I go look at the picture, think about the good times had with him, then close him up and put him away until next time.
18 years Kathy and he still lives in my heart, regardless a date to be sad! You already know I agree its not the same as losing your own child, however; the point is that if he is within your heart then a date doesn't matter. Its what's in your heart that matters, what's in your memory, not a date to be sad.
To be perfectly honest if you said to me that you had outright forgotten him, I would agree with you about being sad. If I forgot my brother fullstop, I know I would be and would want someone to tell me so. You haven't forgotten Brian Kathy, you simply forgot a date and what you have going on in your house is pretty good reason to miss something like a date, regardless its significance, you have a lot on your plate Kathy and that you must accept.