Khloé Kardashian and her sisters have grown so at ease with Caitlyn Jenner's transition that little has changed in the way they interact with one another.

"She has told us we are allowed to call her any name we want to," Khloé told The Project during an interview to promote the sisters' new Kardashian Kids clothing line. "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."

The 65-year-old seems well aware her voice hasn't changed at the same rapid pace as her appearance.

"Women cannot relate to the whole voice thing," US magazine reports Jenner opined during an episode of "I am Cait" on E! on Sunday Aug. 2. "They don't see it as being that important when it is that important, not only for you to speak and order and do all that kind of stuff, but very important for your soul that you're feeling good about that."

For the Kardashian sisters, getting to this level of comfort with Caitlyn's transition has also taken some work, as they become accustomed to all the changing family dynamics.

In an earlier episode of her show, Jenner revealed Khloé was once peeved by some of the things she said in her recent Vanity Fair cover story.

In the promo for an upcoming episode, Kim censures Jenner for what she sees as her bashing her own family. "You look amazing, it's your time -- but you don't have to bash us on your way up," Kim, 34, says in the preview clip. It looks like for the Kardashians, as a reality TV family at least, the one constant remains daily tiffs.