Bruce Jenner's Family Reacts to His Transition on Incredibly Honest Episode of Keeping Up with the Kardashians

Bruce Jenner opened up to his family about transitioning on an emotional and somewhat surprisingly honest episode ofKeeping Up with the Kardashians.

VIDEO: Kim Kardashian says Kris Jenner "cries all the time" about Bruce's transition

In the first of a two-part "About Bruce" special that aired on Sunday, the Olympian spoke candidly with his family about becoming a woman and listened as many of the Kardashian-Jenner kids expressed their questions and a bit of sadness.

"I don't think I've ever been as scared in my life as I was to be honest with my kids," Jenner said.

"I Am a Woman" and 14 more moving statements from Bruce Jenner's 20/20 interview

As Jenner -- who would liked to be referred to by Bruce Jenner and male pronouns for the time being -- mentioned during his interview with Diane Saywer, it was Khloe who took things perhaps the hardest, especially when Jenner told her that he was most worried about Kendall and Kylie and that the transition was coming very soon. "You have children, you don't have to answer to us, but you need to tell us! I don't care that you want to do it, I support you, I have always supported you, but I don't think it's fair that you won't tell us how close this is in the near future. We're still your kids!" Khloe said.

Towards the end of the hour, in a heated conversation, Jenner said, "I'm not lying, Khloe, I just didn't tell you," Jenner said. "Am I doing it right Khloe? ... There's no right way to do this."

Kim, who's known about Jenner's transition the longest of the kids, admitted, "It's been kind of my job to keep this secret for over a decade." While she turned down the option in the special to appear on the 20/20interview, she's remained incredibly supportive during the process, perhaps surprising viewers with the words of wisdom she's shared throughout.

A more lighthearted moment came when the kids talked fashion. "What's your casual style like? Is it like denim on denim," Kourtney asked. "I love good old jeans and a nice sweater."

Watch a clip from Part 2, which will air Monday at 9/8c on E!

Look back on Caitlyn Jenner's inspiring journey: