Is AUTHOR wrong in the post ? POST : So a bit of background, I am one of four daughters and I hold position #3. I'm just gonna name my sisters by their order (#1, #2 &amp; #4) 

When we were little, our parents got divorced which then sort of triggered my mothers mental illness of bipolar due to her unresolved childhood trauma. This got her to pull away from me and my sisters so we had to learn to take care of ourselves. We were aged between 12- 4. #1 &amp;#2 did most of the washing and dishes and stuff were as I took care of food and taking care of #4. Out mother did still cook and clean and take care of us but I dont believe as much as she needed to.

Eventually she started getting aggressive towards #1 and would slap her across the face when she was very angry at us all. If one of us was in the wrong she would yell at us whilst we were cornered in our room (the four of us switched and shared 2 bedrooms).

Fast forward a couple years #1 gets pregnant at 18. At this point we have been forced to move houses a lot and we were all in high levels of stress. In a fit of rage my mother ended up kicking #1 out of home. My mother kept telling us that it was #1s choice to leave.

Things escalated from there and #1 and her daughter no longer speak to our mother dude to fear. #2 is angry at #1 and says that she has abandoned us. #2 &amp; #4 currently have no contact with #1
By this time I was 15 and I had grown to be a tall a physically strong female. This is when my mother started taking out her anger on me instead.

Fast forward again, I am 18 and my mother would hit me on a weekly basis. I've had to step between her and #4 many times. She would insult me and my sisters constantly and when we got upset she told us we were over reacting. I would not be allowed to go out and see my friends as much as I liked or go and relax in my bedroom and my mother would get upset saying that "we are just like #1 and will abandon her" 

October 2018, she didnt speak to me for two days because I went to a friends for three days because I was exhausted. Then I decided that I couldnt handle this anymore and said to her that I want to move out soon. 

She started yelling at me saying she hates me and that I am a horrible child who wants her to kill herself and that she want me out of the house that night. Accompanied by lots of other not so great things. 

So I leave that night with a couple bags of my clothes and I'm now staying with a friend. 

I know my mother is sick and she doesnt mean what she says sometimes and I have now left her with #2 and #4. She wont hurt them because they are small but am I the asshole for leaving my mother when she is sick? And leaving my sisters to deal with my mother?