Khloe Kardashian still slips up with her dad's name: 'My sisters and I call Caitlyn, Bruce'

Adjusting to a gender transition can be difficult enough for a family without having to get the words right…all the time.

Watch The Project video above to see how Caitlyn Jenner reacts when Khloe Kardashian slips up and calls the 65-year-old by her pre-transition name of Bruce.

Khloe, 31, also spoke on the show about her previous struggles with the transition.

"We all got through it and we are all over," she said. "That's completely behind us. So we are just happy for her. We just want her to be happy.

"But there was definitely a moment, that was, really tough for all of us."

One of those tough moments for the family was when their dad revealed the news to them during a special episode of Keeping Up With the Kardashians...