Yevamot 99: Switched at Birth
Talking Talmud - A podcast by Yardaena Osband & Anne Gordon
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Chalitzah, "just in case" - when it's not clear that everyone's relationship is what it appears to have been. Also, a long mishnah: the cases of the "mixed-up children" - which is makes it really difficult to know who needs yibum and who is prohibited from doing yibum. Plus, who got to pick up their terumah at the threshing floor.