Here's a treat for you - a rare NHL fight between brothers. Keith Primeau and Wayne Primeau go at it.
I'm pretty sure the Sutters had a couple of dust ups, too. I'm not certain how many times brothers have fought each other in a NHL game, but I do know who was the first to do so. Sometime back in the 1940s Ken Reardon and Terry Reardon dropped the gloves.