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1. A Kohenes who was married to a Yisrael, who has a child from him or is pregnant from him, may not eat Terumah after she is widowed.
2. The Mishnah discusses a case in which a one-day-old boy prevents the slaves of his Kohen brothers from eating Terumah.
3. If a son is born after his father dies, the father's firstborn son receives the same double portion that he would have received had the additional son not been born. The new son does not detract from the double portion inherited by his firstborn brother.
4. A firstborn (of twin males) born only after his father dies does not receive a double inheritance.
5. The Mishnah lists many Halachos that apply to a girl after the age of three.
A BIT MORE
1. The verse, "And she does not have children [from the Yisrael]," implies that if she does have children, she may not return to eat Terumah in her father's house after she is widowed. The verse, "As when she was a Na'arah," implies that if she is pregnant, she also may not return to eat Terumah in her father's house.
2. The case is where his father married two wives, one of whom was a divorcee and the other was not, and he had sons from both. When the father dies, before the slaves of the sons are divided among the sons it is unclear which slaves are the property of the son of the divorcee and may not eat Terumah (since he may not eat Terumah, as he is an invalid Kohen). Therefore, none of the slaves may eat Terumah until they are divided among the sons.
3. The verse which discusses the double portion of a firstborn states, "And they will be born to him," implying that only those who are born when he is alive are taken into account when calculating the double portion of the firstborn son.
4. This is because the verse which discusses the double portion of a firstborn states, "He (the father) will recognize him (the firstborn son)," implying that a firstborn son receives a double portion only if his father knows him during his lifetime.
5. For example, she becomes married to a Yavam or to a regular man through relations, one is liable for adultery with her if she is married, and she may eat Terumah when she is married to a Kohen.
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