Kourtney Kardashian thinks her sisters are "selfish".
The 'Keeping Up With The Kardashians' star reportedly believes some of her siblings - Kim Kardashian West, Khloé Kardashian, Kendall Jenner and Kylie Jenner - should have stayed with their father, Bruce Jenner, whilst he deals with the emotional turmoil of his recent car crash and his ongoing gender reassignment surgery.
A source said: "Kourtney really thinks that it is kind of messed up and selfish for her sisters to go fly across the country right now when their dad is dealing with the crash on top of his transition.
"Instead of being there for him, they go promote themselves... she was not having any part of it."
The sisters - except Kourtney - flew out to New York City to join Kim's husband Kanye West at his Yeezy Boost x Adidas Originals fashion show earlier this week and promote their own hair care range.
The source added to RadarOnline.com: "Kourtney does not need another reason to celebrate Kanye and Kim right now.
"[She didn't have] any desire to go to Kanye's show, although Kourtney is extremely proud of Kylie for doing such a great job modelling in it.
"Kourtney really didn't want to go and get sucked up into any more family drama."