Quoting%20commentary for Yevamot 109:2

ולילף מדודתו מה דודתו מן האב ולא מן האם אף כאן מן האב ולא מן האם מסתברא מאחותו הוה ליה למילף שכן קרובי עצמו מקרובי עצמו

be made from one's aunt; as one's aunt [is forbidden only when she is] paternal<span class="x" onmousemove="('comment',' When her husband is his father's paternal brother. ');">⁴</span> and not when maternal, so here<span class="x" onmousemove="('comment',' In respect of a wife's sister. ');">³</span> also [the prohibition should apply when she is] paternal and not when maternal! — It stands to reason that the deduction should be made from one's sister, since [laws concerning] his own relatives<span class="x" onmousemove="('comment',' A wife's sister whose relationship to him is due to his own (and not his father's) act of marriage with her sister. ');">⁵</span>

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