Presentation in PDF format The Gemara brings more sources to try to prove whether Rav Sheshet or Rav Acha were correct regarding their debate about a convert being able to marry his brother's wife. If a person was conceived before his mother converted but was born after his mother's conversion, which relative is he permitted/forbidden to marry? If five women's children got mixed at birth, and they all marry and then die without children, and all have brothers through their fathers but are unsure who is the brother of each one, how is the mitzva of yibum fulfilled?