Even my MOTHER forgot my birthday.
As did the majority of my friends, but while that hurts, it doesn't hurt quite as much as your family ignoring you. Especially the person who gave birth to you, for god's sake!
I get ticked off every year because I make a huge point of remembering all my friends' birthdays, and none of them remember mine. I never figure out what I'm doing wrong, though! I work hard throughout the year to be good to people, and then when it's my turn, I get shat on.
Bah humbug.