Hello !

I (31M) got invited to my sister's (40f) birthday sunday. My sister and I got along well enough when we were kids, despite our age difference. Anyway she met the guy who would become (and still is) her husband at 15 and pretty much start living at this house by the age of 18. She was not really living there, but I mean that she was there all the time, while he didn't came to our house very much. This cause me and her to talk and interact with each other less and I became a very different adult from her. We do not get along on anything. No taste in common, etc. Her husband doesn't like me either. He never talk to me and we got nothing to say either. She, on the side, never tried to make any connection with me.

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When I got to live on my own with my girlfriend, I brought gift to birthday. Just money and cards usually, and not much since I don't have very much for myself, but still. Some years into it anyway, I start thinking about what SHE did at my birthday. Which is nothing. No card, no gift... She tells happy birthday through SMS but that's all I ever got. I noticed it and so, thought that I get no need to do it. I was not thinking much of it initially, since she always invite me to eat at her house with the rest of the family at birthdays (which I don't, got no money and not enough space for that) but then I noticed that she and her husband always buy expensive gifts and things for my BIL sister's (same age as me) while I get essentially nothing...

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So I did that, nothing. My mother tells about my reaction to my sister, and her reaction was kind of "Who cares ?". So here's that. No gift, no cards. I got there, eat, happy birthday, and so on.

Sunday tho, we got there for her 40 years old birthday. Same as usual. However today, my mom told me through messages that she was disappointed that I didn't do anything for my sister. Things like it's 40 years old, a special occasion and things like that. The fact that I was cast aside by my sister's family doesn't seem to be of importance for her, apparently. I got 30 years old a year ago and it doesn't seems to be a special occasion for her too.

So here I am, feeling like shit because of what my mother said. I really don't care about what my sister think, but I care alot about my parents and I know that they're gonna be mad at me for some time, maybe even don't talk to me, while I didn't think I did anything wrong. I got no more love for my sister since she doesn't seems to care about me at all and except my girlfriend, nobody cares.

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So, AITA ? I need to know from someone else. Thanks