Had a friend who had a niece like that..At 9 years old,stood over her mother with a knife..When mom woke up,girl smiled and said I could have killed you...I told another friend and her reply was,oh yeah,I brought you into this world and I can take you out...That was the 70s.......
My sister-in-law told my mother this story over coffee (they lived in a in-law apartment with her)
The next time my mother saw the boy, she grabbed his arm, pulled him close and hissed at him "Next time you pull that, I am going to show you what REAL child abuse is."
I loved it. My mom could be a terror when we were misbehaving kids, and we learned to listen to her and respect whatever she said.