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Why does the Gemara (גמרא) require checking a woman's brothers before marriage rather than just checking her father? The shiur resolves this by showing that checking brothers isn't a separate obligation—it's the primary method of verifying who the father truly is. Sons reveal a father's inner character more reliably than daughters, making brother-assessment the practical tool for the fundamental requirement of knowing the father.
The shiur opens with the Gemara (גמרא)'s teaching that when Aharon married Elisheva, daughter of Aminadav and sister of Nachshon, we learn from here that one who marries a woman must check her brothers. Rashi (רש"י) comments "mikan lamdu hanosei ishah tzarich livdok b'achim"—from here we learn that one marrying a woman must investigate the brothers. This raises a fundamental difficulty: why is there a special halacha (הלכה) to check brothers when normally halacha requires checking the father? The Gemara elsewhere establishes numerous rules based on the father's status—an am ha'aretz cannot marry a talmid chacham's daughter, a Yisrael cannot marry a bas kohen, and there are restrictions regarding daughters of certain categories of people. Where does this obligation to check brothers fit into the hierarchy of shidduch requirements? Rabbi Zweig proposes that there is no separate halacha to check brothers at all. Rather, the fundamental requirement is to check the father, but the Torah (תורה) is teaching us the methodology for how to properly assess who the father truly is. The challenge is that it's very difficult to truly know a person's inner character. How do you really determine who someone is at their core? The answer is that you check a person through their children, and specifically through their sons.
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Discussion of the Gemara's teaching from Aharon's marriage to Elisheva regarding checking brothers in shidduchim
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