Of course the rest of you all know this, but I had a hard time remembering if it was "Rabbis apostrophe" or "Rabbi apostrophe s". Well, the group got its name because Chait, Sharfman and Weinberger were all sons of rabbis. (Wikipedia)So, "Rabbis apostrophe".
Again, friends: These gentlemen are rabbis' sons but are not The Rabbis' Sons. Photo for illogical illustrative purposes only.