Halakhah for Yevamot 42:11
והא דרב יהודה בר שילא לאיתויי מאי לאו לאיתויי אשת אחי האם מן האם דכל שבנקבה ערוה בזכר גזרו אשתו משום שניה
and this?<span class="x" onmousemove="('comment',' The wife of a mother's maternal brother. v. n. 4. ');"><sup>27</sup></span> — In this case<span class="x" onmousemove="('comment',' The wife of a mother's maternal brother. v. n. 4. ');"><sup>27</sup></span> she becomes related to him by one act of betrothal;<span class="x" onmousemove="('comment',' The betrothal of the woman by his mother's maternal brother. ');"><sup>28</sup></span>
Sefer HaChinukh
From the laws of the commandment is, for example, that which they, may their memory be blessed, forbade (Yevamot 21b) - to make a fence for this - the daughter-in-law of his son and likewise the daughter-in-law of the son of his son, to the end of the world. And they also forbade only the daughter-in-law of his daughter. And the reason is similar to that which we said above - since the prohibition came in the verse about his daughter-in-law, they decreed about all daughters-in-law that come on account of the son; and they decreed with [the daughter-in-law of] the daughter only, and that is enough for us with that. And these are called secondary [prohibitions].
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