Mesorat%20hashas for Yevamot 233:13

והאנן תנן חוץ משבע נשים ההיא ר' יהודה היא דתנן רבי יהודה מוסיף אף אשת אב והכלה

and a daughter-in-law is obviously included in the expression 'her mother-in-law'.<span class="x" onmousemove="('comment',' As a mother-in-law is precluded from giving evidence for her daughter-in-law so, it is obvious, is the latter (cf. supra n. 5) precluded from giving evidence for the former. There was no need, therefore, to enumerate all the four. The mention of two of these embraces the four. ');">⁴⁴</span> And R. Judah?<span class="x" onmousemove="('comment',' Why in view of the explanation of the Rabbis does he enumerate seven? ');">⁴⁵</span> - Because one can well understand why a mother-in-law should hate her daughter-in-law, since the former believes that the latter squanders her Savings,<span class="x" onmousemove="('comment',' As the wife of her son and heir she would in due course become mistress of her possessions. ');">⁴⁶</span> but why should a daughter-in-law hate her mother-in-law!<span class="x" onmousemove="('comment',' Her ineligibility, therefore, cannot be inferred from the other. Hence it was necessary specifically to mention her. ');">⁴⁷</span>

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