Reference for Kiddushin 145:17

אלא מעלה עשו ביוחסים

for fear lest he marry his paternal sister? - Do all such go [eternally] a-whoring?<span class="x" onmousemove="('comment',' Are we to assume that every child of unknown parentage has the same father-surely not!');">¹⁹</span> Then let him not marry the daughter of a shethukith, lest he marry his paternal sister?

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