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Why does the Torah (תורה) identify Aharon's wife both by her father and her brother Nachshon? The Gemara (גמרא) derives that one must investigate a woman's brother before marriage because children resemble their maternal uncles. The shiur argues this is not about the brother's influence, but rather that checking the brother is the most reliable way to assess the father's true character—since children reveal what parents really are at home, not the persona they project publicly.
The shiur begins by examining a peculiar detail in the Torah (תורה)'s description of Aharon's marriage. The verse identifies his wife Elisheva not only as the daughter of Aminadav, but also as the sister of Nachshon. This redundancy is unusual—typically the Torah only mentions a woman's father when describing a marriage, not her brother. The Gemara (גמרא) addresses this anomaly and derives from it an important principle: when considering marriage, one must investigate not only the woman herself but also her brother, "because most children turn out like the wife's brothers." Rabbi Zweig notes that throughout the Gemara, the emphasis in checking yichus (pedigree) focuses on the father—whether he is a scholar, a communal leader, involved in tzedakah, and so on. This new instruction to check out the brother appears to add an additional requirement. The question then becomes: what exactly is the Gemara teaching? Is it advising us to check both the father and the brother as independent factors, or is there a deeper connection between the two?
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Bava Basra 110a
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