I am calling CPS on my sister !!! TW ABUSE

I recently went to go visit my sister and her children. Over the last few years I feel like she’s lost herself and it hurts to see her go down like this. She’s always in drama, fighting, and arguing with other people all the time. It feels like i hold on because of the children. These children have been taken before due to abuse allegations on both sides. They had bruises and lashes over their bodies. By the time i saw their pictures going viral on the INTERNET, someone had already called CPS. My sister got the kids back and has been living with family for some time. I’m not around much because of how toxic my family is. However i pick up the kids as much as I can!

As my sisters and BIL are telling me about why they stuck a four year old in a corner for over an HOUR because Lee cut his hair, ripped a book, and misbehaved. They’re yanking Lee by the arm because he’s bawling his eyes out in the corner. “Keep going and I’ll give you a reason to cry”. I’m staring flabbergasted! Kori (older child ) was doing school work & they told me that they’re mad at the Kori for telling adults at the school that they’re “Afraid to go home “. I asked why did Kori say that and the response was “ kori knew it was gonna be that ass when he got home. Kori got in trouble at school ..” I told BIL it doesn’t benefit a child to beat them when they’ve done wrong. They don’t learn that way! BIL is not their father, but uncle. I convinced them to take the children outside to play in the yard. They’re all going back and forth about sending the kids off to camp & not having a party for the kids birthday because the child was bad the last few weeks of school. Kori is 5/6. I said they learn this from home. Look at how y’all treat them and talk to them. You treat them like you hate them! When one person commanded them, they all commanded the kids at once and start yelling at them. The kids are looking back and forth - stiff as boards, clearly confused. I firmly told the adults to stop and they’re confusing the children. Walked over to the kids and took them inside myself. Our BIL starts yelling at the Kori because he cried before i got to them . I’m telling BIL if he, the mom, and our other sister stopped yelling at the child then they wouldn’t cry all time or feel the way they do! All they do is yell and treat these kids like a parasite!! Let’s not get started on the fact the children sleep on a toddler bed together on the floor while my sister comfortable sleeps on a big bed with her new bf. I have offered for them(children only) to reside with me & my SO but sister said no.

Am I in the wrong ?

I do apologize if there is some confusion with all the they/them .i am definitely calling and will write again with an update .

To answer the question . Their biological dad’s sister ( their aunt ) hates my sister and when the kids went over to their house , the aunt posted pictures of the children on social media bashing my sister. It was pretty nasty work