Kourtney Kardashian joked she'd be willing to change her kids' surnames so Rob Kardashian's son isn't the only one to carry on the family's "legacy".

Whilst out for dinner with Tyga - who has three-year-old son King Cairo with Blac - and her ex-partner Scott Disick on the latest episode of 'Keeping Up With The Kardashians', the 'Rack City' hitmaker said: "She’s gonna carry on the legacy, like if she has a boy."

To which Kourtney replied: "I could change my kids’ last names." However, Scott wasn't very happy with the idea, telling her: "What the f**k, I’m sitting right here you sick f**k! What the f**k is wrong with you?"

And whilst Kourtney did quip about changing the surnames of her kids - Mason, six, Penelope, three, and Reign, 18 months - to Kardashian, the 37-year-old television personality has been the most supportive of Rob's relationship.

She told her sisters Khloe and Kim previously: "Maybe he thinks that you guys are judgmental because clearly you are ... That's exactly why he didn't tell you, because you're a b***h [Kim]."

Before adding to camera: "I think that Rob has his happy life with Chyna. But I just hope that it gets to the place where he wants to hang out with his family again."

However, the rest of the family haven't been taking it so well with Khloe refusing to attend his wedding.

She said: "Why was he able to propose in front of her whole family but not us? I feel like Rob is deliberately excluding us from so many things and he almost likes this wedge being put between us all ... I'm not going to his wedding if he has a wedding."