UFC Champ Jon Jones -- My Brother's PLAYING In the Super Bowl!

UFC wrecking machine Jon Jones isn't the only professional athlete in his family -- in fact, his older brother is a stud in the NFL ... and will be starting in the SUPER BOWL!!!

Jones -- the reigning UFC Light Heavyweight Champion -- was out in New York yesterday when we asked about his older bro Arthur Jones -- the starting defensive end for the Baltimore Ravens.

"My brother's in the Super Bowl," Jon exclaimed ... "It's crazy man ... it's unbelievable."

When asked how his bro is preparing for the big game, Jon told us, "He's focused ... relaxing with his family, staying hungry ... studying the guy he's going up against."

Jon -- who recently signed a blockbuster sponsorship deal with Nike -- also broke some news for all you shoe freaks out there ... telling us he might have his own sneaker coming out in the near future.