The 31-year-old "Keeping up with the Kardashians" star said that despite the former Olympian's transition into Caitlyn, she and her sisters, Kim Kardashian West, Kourtney, Kylie Jenner and Kendall, call him Bruce because "when she calls me, it's the same voice as Bruce," reported Female First.
"We, my sisters and I, we will call Caitlyn 'Bruce' and we've been told that's completely fine. We are allowed to call her any name we want to.
"Because on the phone, when she calls me, it's the same voice as Bruce. And if I'm not physically with her, it's hard to remember in the moment that I'm talking to Caitlyn, if that makes sense," she said.
"I think there was a hard time for the entire family, that we were all transitioning with her, but in front of an audience, I think that's not really the normal way to go about it, you know.
"There is a lot of raw emotions, that it's hard to do in front of a camera," she said.