Having family members on the same team can be problematic, because usually one is more talented than the other. If Shai is stuck in Iowa, and isn't playing with Zeev, do you risk alienating the family? If Shai(who appears likely to be a fringe NHL'er) makes the NHL team, is there grumbling on the team that he gets preferential treatment because of his brother?
The Sedins, Richards, Mahovlichs were a different because they were all terrific hockey players, so those issues didn't come up.
Scott was clearly the more prominent Niedermayer. But he walked to Anaheim when he could because his brother was there, and I sometimes wonder if the Devils had acquired Rob on the cheap when they could have, if Scott would have stayed in New Jersey and won several more cups there.