text: I have heard Ashkenaziim do so.  Repeatedly.  Sometimes directed at me as personal insult, characterizing me as descended from a 'bastard' despite passage of 4,000 years and despite the Torah's unequivocal recognition and acceptance of polygyny as "hilel" = "halal" = lawful.  My son's Australian father-in-law likewise resents disparagement by POME (Prisoners of Mother England) after two centuries for being descended from "convicts".
  
  You apparently overlook Esa'u marriage to his paternal uncle Ismael's daughter (a fairly common practice in many regions of the world from that time to this), which means there are at LEAST as many Arabs descended from Is'haaq, and therefore Abraham + Sarah (alayhimus-Salaam) as there are Jews.
  
  But in light of your fairly unbiased characterization of this ancient (and ongoing) tale of jealousy between wives, I'll offer you details preserved among the Arabs which may have been forgotten by our Jewish cousins.  It's not complicated:
  
  (CONTINUED BELOW...)