Halakhah for Yevamot 42:13
שלח ליה רב משרשיא מתוסנייא לרב פפי ילמדנו רבינו אשת אחי אבי האב ואחות אבי האב מהו מדלמטה ערוה למעלה נמי גזרו ביה או דלמא הא איתפליג דרתא
sent to R. Papi: Will our Master instruct us as to what is the law concerning the wife of the father's father's [paternal]<span class="x" onmousemove="('comment',' Cf. Rashi a.l. ');"><sup>32</sup></span> brother, and a father's father's sister?<span class="x" onmousemove="('comment',' Paternal or maternal. ');"><sup>33</sup></span> Seeing that the degree below is incest,<span class="x" onmousemove="('comment',' The wife of a father's paternal brother, and a father's paternal or maternal sister. ');"><sup>34</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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