I heard the Gemmorah is justifying Rebbe for omitting key words in the Mishna for his brevity. Succah 2,8 says:
מַעֲשֶׂה וְיָלְדָה כַלָּתוֹ שֶׁל שַׁמַּאי הַזָּקֵן וּפִחֵת אֶת הַמַּעֲזִיבָה וְסִכֵּךְ עַל גַּבֵּי הַמִּטָּה בִּשְׁבִיל הַקָּטָן:
It happened that the daughter-in-law of Shammai the elder gave birth and he opened up the ceiling and put skhakh on top of the bed[posts] on behalf of the minor.
Why is it important to specify that his daughter in law gave birth? We don't know about any other way of kids coming to this world. Is that important that it was his in-law and not his own daughter? What important details are learned from those words (not the Halacha of Succah for Kattan)?