Should I give up on my stister who I feel doesn't even care about me?

Puppystarfish23
I actually have two older stisters. Me and my oldest sister are really close and she's like my best friend but my middle stister makes no effort with us what so ever. I rarely talk about her because there isn't much to say, keeps me out of her life pretty much.

she's always been grumpy and rude. I feel because bouth my parents were middle children they favoritize her and let her get away with more just always saying she's sensitive.

She's very selfish and always putting me and my sister down. I find it so hard to understand her and I've made too many excuses in the pass for her treatment of me.

She always struggled socially growing up and never had any friends. We think she might be autistic but she masks it everything we try and get her medical help.

She's especially mean to me, she tells me I'm fat, disgusting and she only wants to know me when she wants something from me. Ever since she got a boyfriend she's been even more distant with. On my birthday she never came down to see me and spent the whole day in her room with her boyfriend and she made bullshit excuses as to why she did but the truth is she doesn't care.

Even since I've moved out she doesn't bother talking to me I'll face time my family and she'll ignore me. I don't know what I do to make he hate me I just talk and I'm basically Hitler to her.

She keeps asking me if I'm coming to her birthday next week and my boyfriend says I shouldn't even bother because she wouldn't care either way if I'm there or not but I'm not a petty person and I don't like falling out with people but no one sticks up to her and I feel like someone really needs to get her were it hurts to show how she makes everyone else feel.

My parents never told her off growing and me and my oldest stister have tried telling them a million times how horrible she can be but they didn't want to know. My mum's only started to see her ture colours since we moved out.
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I came to visit today and I made all these suggestions of things we could do together with are time off and she just straight up said no to me.

She doesn't care but she's horrible to me and my sister and sees herself as the victim and says we leave her out of everything but everytime we try to spend time with her she pushes us away and belittles us.

I even refuse to go on holiday with her anymore because of how mean she can be.
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Sometimes I wonder if she doesn't really know how to talk to me and she's mean to me because I make her insecure about herself. She always says I think I'm the older stister when I don't I've just grown up quicker than her.

Today she put me down for saying I wanted to do graphic design as job one day and said I shit at art and made fun of me for saying I have hay fever apparently I was making it up for attention. She just makes me so sad at times. She shits on everything I do
Should I give up on my stister who I feel doesn't even care about me?
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