I don't know if you have heard of "Team Hoyt" its a father/son team that enters triathlons (like the ironman) and marathons and the like. The dad does all the physical work but the son is the inspiration. Its truly amazing what these two accomplish.
This is a great tribute to them.
Makes me tear up anytime I read an article or see an interview with them.
I'll edit this post later if I can find the latest article that explains things better than I.