I'll be as brief as possible
I have 4 sisters and 5 brothers (including halves but not steps - its complicated and not always harmonious) I have, atm, got 5 nieces and nephews. I remember all of their birthdays, normally with a card but the younger ones get presents too.
Last Wednesday DS2 was two and only two of my brothers remembered, the rest didn't call, text, send a card or even email/facebook (I know he is only two but I would have passed the message on :) ) this is not an isolated occurrence; DS1 was 11 some months ago and exactly the same thing happened, he is obviously old enough to notice but too sweet to mention it.
I am livid on my DC's behalf AIBU?