text: I'm afraid I'm going to have to ask you to cite that.  
  There is enough evidence in scripture that both were "true parent".  Perhaps Spartan or Yanamamo Indian cultures  (I don't know this for fact, just citing examples of other groups) felt this way but in the OT.  Regardless, if God had wanted Jesus to reveal The First Person as "true parent", He's had 2,000 years to do so.