Commentary for Kiddushin 59:6
הוא דאמר כי האי תנא דתניא ולמדתם אותם את בניכם אין לי אלא בניכם, בני בניכם מנין ת"ל והודעתם לבניך ולבני בניך א"כ מה ת"ל בניכם בניכם ולא בנותיכם
For it was taught: 'And ye shall teach them your sons': hence I only know, your sons. How do I know your sons sons? From the verse: 'and thou shalt make them known unto thy sons and thy sons' sons'. If so, why state, 'thy sons'? - To teach: 'thy sons, but not thy daughters.
Daf Shevui to Kiddushin
The Talmud notes that there is actually a tannaitic debate about whether grandfathers must teach their grandsons Torah. Some read the verse “and your sons’ sons” as requiring a grandfather to teach his grandsons, but some read it metaphorically.
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