I Called My Sister a Whore, and My Niece Feels Guilty For Ruining Her Mom’s Marriage

I apologize for the weird title, but I didn’t know how else to better phrase it. For context, I (32F) reconnected with my younger sister (27F) about half a year ago. I had cut off my family when I had moved out, but I decided to give my sister a second chance after going to therapy for about three years. She has a daughter (12F) who is very smart and is an awesome kid. I’ll call my sister Jez and my niece Annie.
Jez was known as the Mean Popular Girl in high school, and she had Annie when she was 15 with a guy she had a crush on. Unfortunately, he’s not in the picture and I don’t think that he knows. My sister got married a couple years ago to a guy I’ll call Pedro. Since I didn’t really know him well, I had been cordial when I would visit my sister and niece. After catching up and stuff, I felt like my sister Jez and I were finally able to have a relationship. But now that I think about it, my sister hasn’t changed one bit.
Two and a half months ago, I had to pick up Annie from school due to her having what I thought were really bad cramps and because Jez and Pedro were both working late that day. When I picked her up, she kept clutching at her abdomen, saying that it felt like she was being stabbed with knives from the inside. This was really concerning, so I took my neice to the hospital. After what felt like eternity, the doctor let me know what was going on.
Annie was going through a miscarriage.
My stomach dropped when she said that. When I was finally able to see Annie and got her to calm down a bit, I asked her what happened. She seemed really scared, and she begged me not to tell her mom if she told me. I told her that I can’t make that promise, because of what happened to her. I did promise that no matter what though, I would have her back.
That’s when she told me that about a week after she got her period, Pedro had come into her room while her mom was sleeping and SA’d her. He said that she couldn’t tell anyone, or else she’d go to Hell because she’s not a virgin anymore. To say that I was pissed is putting it lightly. I’m glad that CPS and the cops got to him before I did, because that would have been his last day on Earth. He did get arrested and is being charged for SA’ing my niece. Since then, she’s been staying with me since Jez is under investigation as well and I’m the only other family that lives in the same state. Since then, we’d been having visits and calling Jez and stuff. Jez had only short replies for the visits and calls, and seemed emotionally distant. I didn’t understand why until yesterday.
When Annie and I got to the park to visit her mom, Jez was already there. When I saw her, something felt off. I secretly put my phone on record before we sat down, telling Jez that I was putting my phone on vibrate. After a couple of pleasantries, Jez reached into her bag and took out a piece of paper and a pen and told Annie to sign it. I took a look at the paper before she did, and my stomach dropped.
It was a written statement that said that Annie was retracting her statement of what Pedro did, and that she made it all up. I looked at Jez and asked her if this was a joke. She said it wasn’t Annie asked her why she wanted her to sign it, to which Jez looked at Annie with a smile and said, “Oh Annie, I forgive you for fucking my husband and trying to steal him. But he’s mine. Now, you need to stop throwing your temper tantrum like a big girl and sign the paper. You’re already ruining my marriage. Don’t you want momma to be happy?”
At that point, I lost it. I called her a whore for choosing a child grapist over her own daughter, and that she’s a poor excuse of a mother who I pray never has other children. I took Annie and we left with Jez screaming at both me and Annie, saying that we need to do the right thing and tell the truth.
After we got in the car and left, Annie fully broke down and kept screaming about how everything was her fault. Since yesterday, I’ve been reassuring her that what happened wasn’t her fault, and that her mom was wrong. I plan to send CPS the recording today and booking Annie an emergency therapy appointment because of what happened. I can’t help but feel so bad for Annie. She didn’t deserve any of the crap that was thrown at her. Once Pedro’s been sentenced, I plan to file for full custody of Annie and will cut contact with Jez again. She can see her if Annie wants to after she’s 18, but she’s not fucking her up anymore than she’s already done.