This is what happens when the children begin to copy the narcissist.
My youngest daughter aged nine at the time told me that her two siblings aged 15 and 13 were bullying her, calling her names, sniggering, laughing and ridiculing her while at their father house.
I was horrified!
The narcissist obviously would allow this and see nothing wrong with it as he taught them all he knew!
I wrote this letter to the narcissist.