Commentary for Yevamot 42:9

מאי תא שמע דכי אתא רב יהודה בר שילא אמר אמרי במערבא כל שבנקבה ערוה בזכר גזרו על אשתו משום שניה

is a forbidden relative the wife of the male<span class="x" onmousemove="('comment',' In the same degree of relationship as the female. ');">²¹</span> is forbidden in the second degree as a preventive measure; and Raba remarked: 'Is this a general rule? Surely one's mother-in-law is a forbidden relative and yet is one's father-in-law's wife permitted, the daughter of his mother-in-law is a forbidden relative and yet is the wife of the son of his mother-in-law permitted, his step-daughter is a forbidden relative and yet is the wife of his step-son permitted, the daughter of his step-daughter is a forbidden relative and yet is the wife of the son of his step-son permitted'; what, then, does R. Judah b. Shila's [reported rule] include? Does it not then include the case of the wife of a mother's maternal brother, since 'wherever a female<span class="x" onmousemove="('comment',' In any degree of relationship. ');">²²</span> as a forbidden relative<span class="x" onmousemove="('comment',' Such as a mother's maternal sister. ');">²³</span>

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