 The Mishnah interpreted to teach that a son and a daughter have equal inheritance rights, except that a firstborn son takes a double portion in his father's estate but does not take a double portion in his mother's estate.The Mishnah taught that they disregarded a father who said, "My firstborn son shall not inherit a double portion," or "My son shall not inherit with his brothers," because the father's stipulation would be contrary to But a father could distribute his property as gifts during his lifetime so that one son received more than another, or so that the firstborn received merely an equal share, so long as the father did not try to make these conveyances as an inheritance upon his death.The Gemara recounted a discussion regarding the right of the firstborn in Once Rabbi Jannai was walking, leaning on the shoulder of Rabbi Simlai his attendant, and Rabbi Judah the Prince came to meet them.