Commentary for Yevamot 56:16

ראובן ושמעון נשואין שתי אחיות לוי ויהודה נשואין שתי נכריות מת ראובן נולד יששכר וייבם לוי מת שמעון נולד זבולן וייבם יהודה מתו לוי ויהודה בלא בנים ונפלו להו קמי יששכר וזבולן

from one's mother-in-law onward but not to the first six categories. What is the reason? Because this<span class="x" onmousemove="('comment',' That two sisters shall be the daughters of two brothers, and that the one forbidden to one brother shall be permitted to the other brother. V. n. 8. ');">²⁶</span> is only possible in the case of a daughter born from a woman who had been outraged.<span class="x" onmousemove="('comment',' If, of four brothers, A, B, C and D, A had a daughter from a woman he had outraged. and B had a daughter from the same woman whom he outraged after A, and these daughters of A and B, who are maternal sisters, married their father's brothers, C and D, who subsequently died without issue, A's daughter is permitted to B (who is her brother-in-law but otherwise a complete stranger) and is forbidden to A her father. For similar reasons A's daughter is permitted to A and forbidden to B. Thus it is possible for two sisters to marry the two levirs respectively because each one of them is a daughter of the other levir to whom she is forbidden by the law of incest. ');">²⁷</span>

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