The Mayweather's. Roger and Floyd Jr.* are world champions, Floyd Sr. and Jeff were pretty good boxers as well. Roger, Floyd Sr and Jeff are all very good trainers. Koman600 might be thinking of someone else, but that's a pretty good resume for a group of brothers (the older Mayweathers). MY other choice is the Atell's. Abe and Monty, both world champions. Abe is an all time great. * Floyd Jr is the son of Floyd Sr and nephew of Roger and Jeff so his feats may or may not be included.
Mike and Tommy Gibbons The Marquez brothers rate above the Klitschko's as well. Leon hurts the Spinks family in these arguments, but Michael Spinks is a greater fighter by far than Wladimir or Vitali Klitschko. Cue the "he got knocked out by Tyson in a round though hahahaha!" response from some random idiot, to which I'll save some energy later by saying shut the **** up and play in traffic.
This. The Spinkses are pretty seriously overrated as a duo. Michael Spinks was excellent, Leon was not even average. His whole reputation was made by beating an old, underprepared Ali. There's no ****ing way that Spinks+Spinks > Klitschko+Klitschko. Ditto with the Marquez brothers. JMM is a fantastic fighter, and R. Marquez is very good, but I think the Klits overall joint dominance edges out the Marquez brothers. JMM is P4P greater than either brother, but Rafael has never shown anywhere close to the kind of dominance that either Klitschko has. I've never seen two boxing brothers dominate a division with the same type of formidability that the Klitschko's have. I've never seen two boxing brothers and was at a complete loss to think of any other fighter who could even give them a challenge the way I am with the Klits. Not even close.