Siblings fight, all the time, that’s not new anymore. But if you’re from Kardashian-Jenner clan, sibling feud is a little bit serious.

Kourtney Kardashian had been expressing her concern for her younger sister Kylie Jenner the past days.

According to Kourtney, Kylie had been acting weird and had been distant from them and it might be because of Caitlyn Jenner’s transition. Kylie also didn’t return Kourtney’s calls and text messages and seemed like Kylie didn’t want to hang out with her.

Kourtney Kardashian called Kylie Jenner a b—h on last night’s episode of #KUWTK! http://t.co/sdcUqiOQQJ pic.twitter.com/KEakOoGKJd

— Life & Style (@Life_and_Style) September 21, 2015

Kourtney who couldn’t take being ignored talked to their mom about the issue.

“Kylie is such a b***h,” Kourtney told Kris Jenner. “You could at least write back.”

Kris only responded, “She definitely has teenage tendencies.”

Kourtney also tried to talk to Scott Disick about the issue. Kourtney even tried to convince Scott to install a GPS tracker on Kylie’s phone to know what her sister was doing.

Thankfully, Kourtney changed her mind when Scott reminded her that it’s invasion of privacy and illegal. Scott also added that maybe Kylie just wants to hang out with her friends to avoid judgments from other people.

Kourtney managed to convince Scott to go to lunch instead with Kylie, so he could talk to her. After Scott arrived unannounced at a restaurant where Kylie and her friends were, Kylie finally agreed to go to a taco night at Kourtney’s house.

Kylie bailed out the last minute and went alone for Mexican food instead, which was very rude anyway.

Turned out the reason Kylie has been distant is that she’s been spending more quality time with Caitlyn, her transgender dad.

“I feel caught in the middle of Kris and Cait. I don’t want anyone to get hurt,” Kylie said when she talked to Kourtney.

Kylie also said that she wasn’t comfortable telling others about her time with Caitlyn knowing that their mom was upset about Caitlyn’s transition.

Kourtney finally understood what her younger sister was going through and she also admitted that she might need to spend time with Caitlyn as well.