“The thing is with Corey is that he’s not part of the family – he’s their mom’s boyfriend – but sometimes he oversteps boundaries and acts like their stepdad,” claims an insider.

“While everyone is supportive of Kris – they’re glad she’s happy, it’s clear he treats her like a queen and he keeps her young – they draw the line at him getting involved with their lives.

“He’ll tell them what he thinks of their business decisions, or step into fights the sisters are having – it’s not his place and it can upset them.”

In last week’s episode of The Kardashians, Corey, 42, launched his Dolce and Gabbana collection with an intimate family dinner – which Kim, 43, Kourtney, 44, and Kendall, 27, did not attend.

“Corey worked in the music industry as a tour manager and fixer for years, so knows how to handle situations – it’s like he plays ‘bad cop’ and delivers bad news to Kris’s daughters, while Kris gets to play ‘good cop’.

“Sometimes he’ll pick up Kris’s phone and tell her daughters that she’s busy or not available to talk. He’s also spoken up in meetings about the show suggesting storylines for Kim and Khloe – it’s too much. They don’t need his opinion.”

In the first episode of this series of the reality show, Kris, 67, admitted that Kendall wasn’t a fan of Corey – telling the cameras they “hadn’t spoken” in TWO seasons of the show, joking “I think hell froze over, because Corey and Kendall are chatting.”

The feud goes back to 2020, after a fight between Kendall and Kylie, 26, that turned physical – and Corey dragged them apart.

Kendall later called Corey’s behaviour “wild” telling sister Kourtney: “He really just said ‘f*** you’ to me.”

She later told Corey: “I feel like you were the adult in this situation, and you handled it very badly. You said ‘f*** you’ to my face. You can’t even say ‘I’m sorry.’”

He replied: “Let me tell you one thing, Kendall, you’ve been a rude person for years, man. You’re an a****** when you feel like it. You get riled up for no reason.”

The insider adds that while things might be resolved in front of the cameras, off-screen they’re not back to normal.

“Kim could care less about Corey’s opinions and doesn’t really spend a lot of time with him when the cameras aren’t on. Khloe and Kylie probably interact with him the most – Kourt really doesn’t see him ever, and didn’t invite him to her wedding. It’s sad, but everyone puts on a smile for the cameras to keep Kris happy.”

The Kardashian’s rep has been approached for comment.