Reference for Yevamot 41:18

אמר רב ארבע נשים יש להן הפסק נקיט רב בידיה תלת אשת אחי האם מן האב ואשת אחי האב מן האם וכלתו וזעירי מוסיף אף אשת אבי אמו אמר רב נחמן בר יצחק וסימניך דעילאי דרב

— As he wished to state in the latter clause, 'The wife of his step-son may say to him, "I am permitted to you though my daughter is forbidden to you", and though my daughter is forbidden to you Pentateuchally the Rabbis did not forbid me as a preventive measure', he stated in the previous clause also 'the daughter of his step-son'. If so,<span class="x" onmousemove="('comment',' [If this is the reason for including Pentateuchal prohibition in this list]. ');">⁴⁴</span> could not the wife of his father-In-law also say, 'I am permitted to you and my daughter is forbidden to you', since she is his wife's sister?<span class="x" onmousemove="('comment',' [And thus let him also include the daughter of his mother-in-law.] ');">⁴⁵</span> -The prohibition of the one<span class="x" onmousemove="('comment',' Lit., that', the daughter of his step-son. ');">⁴⁶</span>

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