How many people are females?

A genealogist has determined that A, B, C, D, E, F, and G are the father, the mother, the aunt, the brother, the sister, the wife and the daughter of Z, but she has been unable to determine which person has which status.  She knows:
  • C and D are of the same sex
  • A and B are not of the same sex
  • F was born before A
  • D is not the mother Z

How many of the seven people A, B, C, D, E, F, and G are females?


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