<div dir="ltr"><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><div> RAMiller, regarding a brother and sister marrying as a result of sperm donation</div><span style="border-collapse:separate;font-family:arial;font-size:small"><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><div>
<span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><br></span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">>>></span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><br></span></div>: You're thinking in terms of "kol d'parish meruba parish". Could it<br>
: be that this case is considered "kavua", so that it is judged to be a<br>: 50/50 possibility?<br>>><br><br></span><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><br>
</span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">RMBerger<br><br></span><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">>></span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">I don't think a set that is leisa leqaman can have members that are<br>qavu'a. I think of qavu'ah as a situation that would have been a ruba<br>
de'isa leqaman were it not that we had once known and pasqened about<br>the state of the members in the past.<br><br></span><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">>>></span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><br>Rava in Kiddushin 73a, says a shtuki is muttar min haTorah, because </span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">"kol d'parish miruba parush". The gmara asks on him that perhaps "kavua"</span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">applies here. The g'mara says that even kavua cannot make the shtuki any more than a </span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">safek mamzer (mechtza al mechtza) , and a safek mamzer is muttar bat Yisrael min</span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">haTorah. So the gmara does apply the concept of kavua to yuchasin, although the</span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">discussion is about the shtuki himself with any given bat Yisrael, and we are talking about the set of possible fathers of the shtuki in a given geographical area, which possibly may be considered a ruba d'ita kaman.</span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">Indeed, the gmara there then says perhaps a shtuki is assur midrabban to prevent</span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">a brother and sister marrying, and rejects this as being so unlikely (lo shchicha) that it would not be a reasonable basis of a gzeira. The gmara concluded that a shtuki is assur midrabbanan as a safek mamzer, despite being muttar min haTorah: "maalah asu b'yuchasin".</span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><br></span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">The Aruch HaShulchan YD 110 sk 14 cites this gmara, and says that the kavua mentioned here is a different (weaker) kavua than the classic kavua case: "ein hasafek nolad bimkom hakvuit". Ayen sham.</span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><br></span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">The gmara similarly reject the premise that an asufi is assur b'bat Yisrael in order to prevent</span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">a brother and sister from marrying, this possibility being too unlikely be a reasonable basis of a gzeira, as above.</span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><br></span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">Only shtuki and assufi are forbidden to marry (midrabbanan); an "regular" orphan who does not know his parents may marry a bat Yisrael, and we are not choshesh for a brother and sister marrying.</span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">The Rambam states this explicitly in Hilchot Issurei Biah 15:29. </span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse"><br>
</span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">This is regarding the actions of the doubtful offspring.</span></div><div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">However, in Yevamot 37b, it is stated that one should avoid having offspring in a manner that may cause the possibility of a brother and sister marrying, since the result of such a marriage (despite the innocence of the parents) is nevertheless a mamzer. One of the cases, that of a man marrying women in different countries, is cited as forbidden in EH 2:11. </span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">The unlikelihood of such an eventuality is insufficient to permit one to create the circumstances under which it may occur. </span></div>
<div><span style="font-family:arial, sans-serif;font-size:13px;border-collapse:collapse">One may reasonably forbid a Jew to act as a sperm donor based on this concept. </span></div><div><font face="arial, sans-serif"><span style="border-collapse:collapse"><br>
</span></font></div></div></div></span></span><div><div><div><font face="arial, sans-serif"><span style="border-collapse:collapse"><a href="http://hebrewbooks.org/pdfpager.aspx?req=14313&st=&pgnum=146&hilite=" target="_blank">http://hebrewbooks.org/pdfpager.aspx?req=14313&st=&pgnum=146&hilite=</a></span></font></div>
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