They didn't forget, but when I was ten, they observed it very, very grudgingly. No cake, no presents, just dinner at a place I didn't like, with one friend. And when we got home, my dad got out the box of candy I'd given him for Valentine's Day (two weeks earlier) and sat ostentatiously eating it without offering me any.

Nope! This would never happen today! With social media and all

Nope, they never did.
Schrodinger's cat walks into a bar and doesn't.

I am experiencing it right now. Today is my birthday. And my father has not said a thing yet. However, he did tell me all about the great wedding my stepsister had in Hawaii while I was downstairs eating dinner for an hour. Really identifying with the movie right now
"Oh my God! You put a living room where the crack den used to be!"

bad as my dad's memory is, no never forgot his 1st born's bday.

child please

Any time I think they may be forgetting it, I remind them over and over starting a week or two beforehand.

My birthday is 12 days after my sister's birthday, so no. Also, we have a family tradition that I insist we keep for each birthday. Whoever's birthday it is, they get to choose where we, take them out for dinner. The birthday boy, girl, man, or woman chooses the restaurant. My mother was in charge of the planning and remembering. When she died, it fell to me because my father can't remember anything, especially his anniversary or his anniversary with my step-mother [after mom died]. We now go in two groups, because with my sister and nieces and everyone else, it's hard to coordinate. But we've maintained this tradition since I was at least five, approaching 40 years now. My dad still cannot remember anything. He passed his first Business Organizing Scheduling System [64k] an early PDA by Casio, on to me. He still can't remember anything.

No.Not ever.

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my father never remembered my birthday. my birthday is nov 18th. he always thinks it is some other time of the month.
i dont make a big deal about it. he isnt big on birthdays. when i lived with him as a teenager, he usually wanted me to remind him . he would say happy birthday and that was it. no big deal
once in a while, he took me out to restaurant. like my 16th birthday. he took me to sizzlers restaurant with my friend lol

My deadbeat father didn't even bother to remember what my name was half the time. He had no idea when my birthday was, or even what year I was born or how old I was. I grew up in the same house as him, those things just weren't considered meaningful or important by him. Thankfully I told him to beep off and die the moment I was able to live independently, so now I don't have to remember his either.
The mirror it's broken.
Yes, I know. I like it that way. Makes me look the way I feel.

Nobody ever acknowledges mine, but I'm use to it. Lol

Yes. My parents and brothers forgot my birthday about 4 years ago. It did hurt my feelings. They did remember a few days after. I guess it doesn't really matter, but stuff like this does happen!

My folks actually did when I turned 20. I was living on the other side of the country so it wasn't like I was in constant visual contact with my folks. That would have been far worse. My dad did call me the next day I think. I believe I was really annoyed about it at the time but honestly I had totally forgotten about this until I saw your thread.
The grave is no bar to my call.

I love this movie, but you are right, there is no way both parents, three siblings and two sets of grandparents forget about your 16th birthday.
I know some families make a much bigger deal out of birthdays than others. Birthdays were always a big deal in my family and even if someone in the family was getting married, we would do something special for whoever's birthday is was.

I know this contrivance is fundamental to the movie, but the idea that both parents, both sets of grand parents and her siblings forget her birthday, because they are all just so excited about the dopey sister's wedding is just ridiculous.