Halakhah for Yevamot 42:8
אשת אחי האב מן האב ערוה אשת אחי האב מן האם שניה וגזרו על אשת אחי האם מן האב משום אשת אחי האב מן האם וטעמא מאי משום דכולהו דבי דודי קרי להו
he stated that In the West<span class="x" onmousemove="('comment',' Palestine. ');"><sup>18</sup></span> the rule was laid down<span class="x" onmousemove="('comment',' Lit., 'they said'. ');"><sup>19</sup></span> that whenever a female<span class="x" onmousemove="('comment',' In any degree of relationship. ');"><sup>20</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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