I don't think NBC did any real backstory -- I think they just mentioned it in passing when they were doing crowd coverage and got a shot of his brother in the mass of spectators. Something like, "And there's Bilodeau's brother, who has cerebral palsy."

And then when the cameras showed them hugging, I realized that the guy who won (Bilodeau) was the same guy with the disabled brother.

It seems as if NBC is doing a slightly better job of covering the non-American competitors than in past years, but so far it's still touch and go. ;-)