Kourtney was discussing the behaviour of Penelope with her former partner Scott Disick, along with her mother Kris Jenner and her boyfriend Corey Gamble, in an episode of "Keeping Up With The Kardash," reports mirror.co.uk.
She said that her nanny had quit the role after seven-year-old Penelope was "out of control" and 'blacking out' during fits of rage.
Describing the moment, which was the final straw for her nanny, Kourtney said: "She was putting (Penelope) in the car and Penelope scratched her face, but P can be out of control. I think she blacks out and does these wild things."
Kris was not buying this though and imparted some words of wisdom. "This is so much more serious than I think you realise. I had six kids... not one time in my entire life did anyone ever have a complaint like this," she said.
Kourtney challenged this, saying: "I scratched you and I used to f***ing slap my nannies like, bam, across the face."
Kris said: "We need to take care of this before it gets too far out of control."
Kris' 38-year-old boyfriend Gamble thought he would raise a few questions but they didn't go down too well. He asked: "If a kid scratched you, can you pop the kid and it's cool?"
Kourtney replied: "No, but you could also say something to her, in the moment."
Scott though was taking a harder line, saying that he would be "whipping her a**," if Penelope "scratched me for no reason."
Kourtney shares co-parenting responsibilities with Scott for their children, Mason, nine, Penelope, seven and Reign, four.
( With inputs from IANS )