Khloe Kardashian to Kourtney: Scott Is "Brainwashing You"

Khloe Kardashian to Kourtney: Scott Is "Brainwashing You"

The infighting continues at the Kardashian household.

In this sneak peek of the upcoming episode of Keeping Up With the Kardashians (airing Sunday on E!), Khloe Kardashian continues to throw blows at Kourtney's boyfriend, Scott Disick.

After she accused Disick of intentionally getting her sister pregnant and then slapped him in the fourth season premiere last week, Khloe continues the fight. (Watch the clip above.)

"He's brainwashing you!" she tells Kourtney -- who gave birth to son Mason Dash on Monday -- after Disick said her slap was out of line.

Her response? "You are disgusting, and you are going way too overboard."

While Kourtney watches their fight from the balcony, Khloe tells him to shut up.

"Shut up?" Disick fires back. "Why don't you get mad again? Go hitting somebody!"