RE: The effect of dispute amongst parents on their children.
I watch such things in movies or read them in fictional books.
As i was reading your post, i had to take a pause, like what!!?
How would it ever get to that point.. The girl must be deeply scared. That's why they say that, someone doesn't just turn evil or wicked overnight, something must have happened somewhere to get the person to be that way.
I can imagine how the girl would live with the stigma not to talk of her younger sister.
So such things really happen, how sad😪. I hope you comforted her.