Bruce Jenner has applauded Kim Kardashian [1] for being "the most accepting" member of his family as he transitions into a woman, but the reality star has also shown empathy for her mom and Bruce's ex-wife, Kris Jenner. A clip from E!'s intimate Keeping Up With the Kardashians: About Bruce special [2], airing on Sunday, captures Kim's heart to heart with sisters Kendall and Kylie Jenner [3]. After discussing the magnitude of Bruce's then-upcoming interview with Diane Sawyer, Kim goes into detail about how her mom was reacting to the changes. "She cries all the time," Kim says. Get a preview of her emotional release in the video, above.