Call the cops, call the media. The girl learned this from her father. Publish his name and business info. Drive him out. He is a cancer and he has infected his daughter. Shine a light on this roach.
“The girl learned this from her father.”
That’s the big problem right there. If the father is a physician of some kind, he’s in a position to do a lot of damage if he chooses. A six-year-old girl probably doesn’t know what cutting someone’s throat really means...although it that culture, maybe. But mommy and daddy...