Transcript for How Caitlyn Jenner's relationship with her kids has changed: Part 5
Say 1, 2, -- Reporter: Home movies of a high-spirited, high-energy dream dad. Wave good-bye to mommy. Good-bye. Reporter: The athlete effortlessly lifting his children in the air. Come on, get on your bike, let's go for it. Reporter: This picture is still her favorite. Jenner children, the Kardashian stepchildren all together. I'm so glad it's in my memory bank. Reporter: But there is always a story the pictures don't tell. Like how a dream dad was wrestling with gender, falling into a depression, retreating into isolated house on a hill for nearly a decade. I lived about two hills over here. And I just kind of dropped out of society. And also, I dropped out as a parent. Reporter: A decade in which the Jenner children rarely saw him. And later, after he emerged, he was soon absorbed in the Kardashian show. But at the time of the announcement two years ago, Jenner's four older children sent word they wanted to be supportive. To go on camera, to say the past is past and they're happy to see their dad's suffering gone. And I just held his hand and I cried with him, and I just told him how proud of him I was and how inspired I was. The first thing I thought was just like, "It finally makes sense." Yeah. Reporter: They still calling you dad? Yeah. Still calls me dad. Reporter: Two years ago when life held out the possibility that Caitlyn Jenner could now be present every day, in a way that Bruce was not. Some I have remained very close to. And a couple of them, I'm a little more distant. I have to admit I'll sit here and wonder, is it because of me transitioning? Or is it because their life is so busy that they don't call, like, all the time? But every parent goes through that. I've got all these kids, all hard-working. All doing very well. Who calls the most? None of them. Nobody calls that much. I mostly reach out to them. Obviously the Jenner side calls more. But they all have their own lives. Reporter: So what about her life ahead? Someone new at her side? As we looked through old pictures, we saw some of the girls Bruce had loved. I had this crush. And why I remember her name, this girl right here, Joyce Nelson. Yeah, I had a crush on her when I was in kindergarten. Yes! Reporter: There were also the three marriages. The last one playing out in reality TV. With Bruce often a kind of punching bag. Do I talk to, obviously the last one, Kris, all the time? No. She's kind of moved on. I certainly have moved on. But we're fine with each other. Reporter: At this point someone joins us. Older sister Pam. I would love to see her have a companion someday. No idea what gender that companion would be, actually. I'm not sure you -- A nice person. A nice person. I don't -- I don't see really even dating in my future. I have not been approached. I've never been out on a date with -- Reporter: In two years? Yeah. Yeah. Never been out. I just have a lot of friends. Reporter: That doesn't necessarily heal loneliness. My life revolves around my kids. And they'll be in my life until the day I die. Reporter: By the way, this song was written by her son, Brandon Jenner, and his wife Leah. ??? Every time you fall I fall ??? ??? every time you cry I cry ??? Reporter: And Caitlyn Jenner says she has a lesson for every parent, and an irony. She writes, if god refuses to make peace with me, that will be the reason. There's no excuse for not being a good parent, no matter how many problems that you have. No excuse for that. Reporter: And tonight, the Jenner children have sent word they preferred to stay private. Instead giving us a statement, "We love our father and have deep admiration for her bravery. Every has unique milestones, but we can honestly say Caitlyn's gender transition has brought our family closer."
This transcript has been automatically generated and may not be 100% accurate.