Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: Been debating whether to post this considering it isn't recent, but this has been a constant at the back of my mind now for well over a year and its been happening for some time. Be warned this is long as I need to give some background..

My sister and I never got along when we were kids, it look her moving out and going to Uni on the other side of the country for us to even begin to get along. Our parents divorced, she came home for a little bit and things were okay. 

Then she met her future husband and I noticed she was starting to change, and not for the better so we stopped talking. About 2 years after they were married he was in an accident and he was medically discharged from the Army. At the end of the day he is alright, and I noticed my sister started to act herself again and we started to talk once more. 

Fast forward a few years and once more I notice she changing again. This comes after she and I put some money together to fly mum over to visit her grandkids. Mum then starts to call me several times in the day, in tears because of the way my sister is treating her and how she and her husband are treating the kids. Mum explained at the time as, the husband was acting the drill sergeant and the kids were the soldiers, and my sister agreed with everything he did (another version of her husband).  The more she told me the more I realised my sister is becoming a stranger. 

Next time I see her, its at our cousins wedding. First day she is at the house and she threatens to hit my dog for "being undisciplined", now I had just come home from work; I was tired, I didn't want to see her and mum had been texting me asking me to come home early. To say the least I replied "you touch a hair on my dog and you know where the front door is", bare in mind I never talk back, I hate confrontation. But threaten my dog and that filter is gone. To say the least she didn't appreciate it.

Now comes the wedding day. We are getting along, drinking together, sharing jokes, talking, taking selfies. Then my mum, aunt and I say we are ready to go, and she goes off and starts talk to another cousin (she isn't our cousin, she's mentally disabled but it makes it easier for her to think of us that way) who she has made very clear she doesn't like. Then things go downhill; mum realises the keys are missing. Now I didn't bring my keys like I normally do so we didn't have a spare. So here we are scouring the car park looking for said keys and my sister is stomping around , pissed and acting the victim. Its not her keys that are missing, she was the one that avoided leaving in the first place. She isn't the one who had to break a window and crawl inside in a $80 dress, calm the dog down, find the spare keys then go back to the reception.

I asked my uncle and aunt that night "Do you believe me now how much she has changed?" No one believe me in til that night.

Fast forward several years to the "incident" of December 2017. My phone is flashing at me while I'm at work, I have a Facebook alert "\*\*\* has accepted your friend request"... huh? I didn't send a friend request. Mum has access to my Facebook  account as she sends herself lives for a game she plays that I don't, the only thing I can think of is that she thought she was on her profile and sent it thinking she unfriended her (oh and during this time mum has also had a minor stroke so memory issues). Mum says she didn't. Okay whatever, I'll think on it. I unfriended my sister that night. Why? Because we hadn't spoken in years, I always text her on birthdays, Christmas and New Years with nothing in return and I also didn't like the person she had become.

It was for my own piece of mind. It is now the next day and mum sends me a screenshot of a message my sister sent; "\*\*\* is a little manipulative bitch. She friends me on Facebook to see what I've been up to and then unfriends me after she's satisfied. If she fucken wanted to know she should of asked" something to that effect, I don't really want to go and find the message. If she just sent that to mum, yeah fine whatever. Mum chose not to respond as she didn't want to take sides, which is understandable. Only my sister decides to post it on her Facebook page, and its just a rockslide from there.

She accuses mum for taking sides, continues to call me a bitch and manipulative, no matter what mum says she twists and turns it to her own agenda. I knew what she was like and I didn't want that toxicity in my life. I refuse to text her to set things right, I feel like she over reacted over a Facebook invite. Last year at Christmas, mum notices her house is up for sale and approaches her about it. Shit hits the fan once again, she's bringing up that incident once again, continues to accuse us both, in til mum has had enough and has now cut her out of her life. She will not see her grandkids again, my sister will make sure of that.

AITA for not responding to set things right back in 2017? If I had done maybe last year would've not happened and my mum would still be able to speak to her grandkids. I feel like I mishandled the situation and I feel like I'm to blame, that I'm the asshole.

Its ironic, its the worst memories you remember and the ones you want to forget the most.

not setting things right with my sister