Commentary for Yevamot 237:2

היתה לה חמות אינה חוששת יצתה מליאה חוששת רבי יהושע אומר אינה חוששת:

IF SHE HAD<span class="x" onmousemove="('comment',' Overseas. ');">⁴</span> A MOTHER-IN-LAW<span class="x" onmousemove="('comment',' Who, at the time of her departure, had no other son but the one who is now dead. ');">⁵</span> SHE NEED NOT APPREHEND [THE POSSIBILITY OF THE BIRTH OF ANOTHER SON];<span class="x" onmousemove="('comment',' To her mother-in-law. It is only in respect of a rival that the possibility of a birth must be taken notice of, since a child, whatever its sex, exempts the woman from the levirate obligations. In the case of a mother-in-law, however, the birth of a female would not affect the woman's freedom to marry again, since it is only a male that subjects her to the levirate obligations. There is no need to apprehend that the mother-in-law had not only (a) given birth to a child but also (b) that that child was not a female but a male. ');">⁶</span>

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