Transcript for Two Brothers Make a Long Trek to Raise Awareness
America strong. And there's a song that goes, he ain't heavy, he's my brother. We're not super human. We're just two brothers and we had an idea. Reporter: Meet 16-year-old hunter gandy and his 9-year-old brother, Braden. There you go. Reporter: Braden has Serb ball palsy and one week ago, both embarked in a 111-mile journey to raise awareness. I have to use a walker. Push up. Hunter, he helps me with walking. He is always there for me. Reporter: And on this journey, hunter carrying his younger brother. I've carried Braden on my back as long as I can remember. Sometimes it feels more natural to have him on my back than it does to have him off. Reporter: Checking in every day with their supporters. Going to be 18 miles today. Reporter: There were so many cheers along the route. And 110 miles in, Braden gets down. And walks the final half mile himself. Hi, David. Reporter: Tonight, the brothers checking in with us. We're so thankful for all the support. Reporter: And it turns out, it's little Braden who tonight is proud of his big brother. He's made a lot of change in the world, so, if everyone could be like that, then, the world would be a great place. He's got a point. Hunter and Braden, America strong. Thank you for watching here on a Wednesday night. I'm David Muir. I hope to see you right back here tomorrow. Until then, from all of This is "Jeopardy!" Here are today's contestants --
This transcript has been automatically generated and may not be 100% accurate.