A couple of years ago, Father Rusty introduced me to the story of the Dick and Ricky Hoyt. They are a father and son team who have competed in Ironman together. The thing is, Ricky Hoyt is disabled, and can not walk, nor swim, nor bike, nor run, so it is his father who makes it possible for them to compete together.
Here's an inspirational video about them:
And here is a story about them and how they trained for Ironman: