 Rabbi Judah the Prince asked Rabbi Jannai what the Scriptural basis was for the proposition that a son takes precedence over a daughter in the inheritance of a mother's estate.Rabbi Jannai replied that the plural use of the term "tribes" in the discussion of the inheritance of the daughters of Zelophehad in indicates that the mother's tribe is to be compared to the father's tribe, and as in the case of the father's tribe, a son takes precedence over a daughter, so in the case of the mother's tribe, a son should take precedence over a daughter.Rabbi Judah the Prince challenged Rabbi Jannai, saying that if it this were so, one could say that as in the case of the father's tribe, a firstborn takes a double portion, so in the case of the mother's tribe would a firstborn take a double portion.