Am I in the wrong and just not seeing it?

Ni

Long post I’m sorry!

I have no contact with my sister (20) because she was hitting her boyfriends infant since she didn’t like the mother. She’s ALWAYS fighting someone, pulling guns out etc. and is very unstable and ghetto. She even tried to fight her grandma. I’m the complete opposite. I’m 27. Anyways, her boyfriend ended up killing himself in front of her the other day. She came to visit my twin and I didn’t know she was there so I went to my twins house too.. I go there every single day to help with my niece. When I got there my twin said she was actually taking her home right then so I just sat at the table with my 6 month old since she was leaving. Then before leaving she corners me at the table asking why I don’t talk to her anymore.. I told her because she was abusing the baby and that made me uncomfortable and sad for the child. She got so angry and started screaming and threatening to hit me with my baby in my hands. I told her if she hits me I will protect myself and my baby. She took that as me starting a fight and went ballistic. I was talking calmly to her. My twin and brother in law came in screaming at me telling me she’s welcomed here anytime she wants and that I’m never going to be allowed back because I shouldn’t have stuck up for myself since she’s going through something. They had to hold her back because she was trying to get to me and my baby. Then she started threatening to break the windows in my car. My baby is screaming at this point because she’s about 3 feet from his face screaming smacking her hands together trying to hit us. There was no where I could go since I was cornered. Now they’re mad at me and won’t talk to me or allow me to see my niece. They’re saying I’m the issue because I didn’t reach out to her to give her sympathy. My baby had nightmares crying in his sleep. She started texting me after threatening to have men come to my house and hurt me because I didn’t reach out to her.

She’s has always been a bully and even kicked out of school for bullying.