Fans of combat sports are probably already aware that announcers Michael Buffer and Bruce Buffer are half brothers. Michael is known for "Let's Get Ready To Rumble!" before boxing matches while Bruce tees up UFC matches with his "It's Time!"

But even dedicated enthusiasts of both sports might not be familiar with the Buffers' family story. Michael grew up in foster care, and the two men didn't meet until they were adults. As Michael became famous working some of boxing's biggest events, Bruce began to notice there was some resemblance between them. Bruce asked their father, who then told him the full story.

After they finally connected, the two Buffers decided to go into business together. HBO's Real Sports takes a closer look at their unique relationship. It is part of an episode that premieres Tuesday at 10 p.m. ET/PT Tuesday. Here's a preview: