Inside Kourtney Kardashian’s ‘Tense’ Dinner With Sofia Richie & Scott Disick

Kourtney Kardashian and Scott Disick had a tumultuous relationship for nine years until they finally called it quits. Now that he has moved in with his girlfriend Sofia Richie, things have only more tense between the former couple. On Sunday, all three of them sat down at Nobu for a dinner to hash everything out. Scroll for more details.

Photos obtained by RadarOnline show that Kourtney arrived in a separate vehicle than Scott and Sofia. This meeting comes just after Scott went on a trip with Sofia to Australia and prior to that went on a family vacation with Kourtney to Bali.

A source told PEOPLE that Kourtney, “doesn’t necessarily care to get to know Sofia better, but she feels she needs to because of the kids. Sofia spends time with Kourtney’s kids, so Kourtney wants to make sure they are all on the same page.” Scott, 35, and Kourtney, 39, share three children together – Mason, 8, Penelope, 6, and Reign, 3.

The source continued, “Scott and Sofia tend to get into arguments. Kourtney wants to make sure the kids are in a positive environment when they are at Scott’s house. She is setting up rules for how things need to be when the kids are with Scott.” The Keeping Up With The Kardashians star previously blasted Scott for introducing the kids to Sofia before the holidays this year.