Transcript for Parents speak out for 1st time after son's water park death
We are back now with that ABC news exclusive. The parents of a 10-year-old boy who died at a Kansas water park over the summer. Well, they are now speaking out for the first time and our Matt Gutman was the one to sit down with them. Oh, we remember the story, oh, so well. Such a brutal story and good morning. As a parent I can tell you that, you know, 10-year-old Caleb was going down the world's biggest water slide. It's a parents' worst nightmare. That's how he was killed but what's most striking about his parents isn't their suffering, it's that they remain unbroken and spoke to us partly to highlight the problems in amusement park safety. On the August day the schwabs went to the world's tallest water slide admission was free for the families of state legislators. But that thrill ride would cost the Kansas state legislator and his wife what was most dear. Went to the park and five came back. Reporter: Six went to the park. Five came back. Reporter: Now for the first time Scott and Michele Schwab recount that tortured Sunday. The schwabs decided to take their four boys including 10-year-old Caleb, you see him here dancing with his baby brother to the schlitterbahn water park. Caleb and his 12-year-old brother Nathan went straight to the 170-foot scaffold of verruckt which means insane in German. Before they took off I said, brothers stick together. And he says, I know, dad. I said, look at me, brothers stick together. I know, dad. Reporter: It was the last time they'd see Caleb alive. Big brother Nathan dutifully waited for him at the bottom when the unimaginable happened. He was screaming, he flew from verruckt, he flew from verruckt. Reporter: The horror of it made it nearly impossible for 12-year-old Nathan to explain what he'd seen. There was a gentleman who wouldn't allow me to come close enough to see what was going on and he just kept saying, no, trust me, you don't want to go any further. Reporter: Was in such shock good samaritans had to confirm it. I need to hear you say it. Is my son dead. He shook his head. I need to hear it. Is my son dead? Yes, he is. Reporter: When it opened it was touted as an extreme thrill ride. Are you insane? Reporter: Test videos including clips of rafts going off the slide. They call that insane. Reporter: ABC news was the first news organization to cover it. I think I'm about to be dropped off a cliff. Reporter: They settled for an undisclosed sum which goes to Caleb's three brothers. Call it an accident. But you and your attorneys believe negligence caused -- Oh, yeah, it's an accident. But there's an accounting, because someone was negligent. Reporter: Today the family is sustaining itself on faith. ??? Jolly Christmas ??? Reporter: And those videos of Caleb. There's types that you're just like I can't look at that right now. Yeah. And there's other times, you know, you can't sleep. You want to look at it. Reporter: You can't do it -- He can't bear to watch the videos at times. Sometimes it's too hard. Reporter: What do you miss most about Caleb? Giving him hug Hugs. Hearing about his day. My morning hug. Watching him play soccer. I mean, so much, so many things. Reporter: Why was it important for you to do this interview? We have a box of greeting cards from around the world and we just want people to know we're thankful and we're still hurting buff we're going to be okay. Reporter: An amazing family. I asked what message they'd like to send to the folks watching. They said be in the moment and hold your kids just a little bit tighter. Now there have been no criminal charges in the case and we've reached out to the park that told us safety is its top priority. Problem is amusement ride safety is governed by a patchwork of voluntary regulations and, robin, enforcement varies from state to state. What about the ride, is it still in use. It's not in use. It's still up. The investigation is not fully concluded. When it is it will be torn down and the family says that won't happen soon enough. I'm sure for them. You never know what you're reaching out to a family like that as they said all those cards and letters helped them. Brought them some measure of comfort. It did. Matt, thank you.
This transcript has been automatically generated and may not be 100% accurate.