One who says, “That man, my firstborn son, shall not take a double share,” [or] “That man, my son, shall not inherit with his brothers,” —- has not said anything, because he has stipulated [contrary] to what is written in the Torah.  One who appor-tions his estate to his sons orally, increasing [the share of] one and decreasing [the share of] one, or making the firstborn equal to them, his words are upheld. But if he said [that it was to be] by inheritance, he has not said anything. [If] he wrote —- whether in the beginning, the middle, or the end —- [that it was to be] a gift, his words are upheld.  One who says, “That man shall inherit me,” in a case in which there is a daughter, [or] “My daughter shall inherit me,” in a case in which there is a son, he has not said anything, because he has stipulated [contrary] to what is written in the Torah. R' Yochanan ben Ber-okah says: If he said [this] about one who is eligible for the inheritance, his words are upheld; and [if] about one who is not eli-gible for the inheritance, his words are not upheld.  One who signs over his property to another and sets aside his sons, what he did is done, but the Sages are not pleased with him. Rabban Shimon ben Gamliel says: If his sons did not conduct themselves properly, he is remembered for good.