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וְדַע, דַּאֲפִלּוּ אִם שָׁמַע לִבְנוֹ וּבִתּוֹ הַקְּטַנִּים, שֶׁהֵם מְדַבְּרִים לָשׁוֹן הָרָע, מִצְּוָה לִגְעֹר בָּהֶם וּלְהַפְרִישָׁם מִזֶּה, כְּדִכְתִיב {משלי כ"ב ו'}: "חֲנֹךְ לַנַּעַר עַל פִּי דּרְכּוֹ" וְגוֹ', וּכְמוֹ שֶׁנִּתְבָּאֵר בְּאֹרַח חַיִּים {בסימן שמ"ג סעיף א'} לְעִנְיַן כָּל אִסוּרִים שֶׁבַּתּוֹרָה*.
And know that even if he heard his young son and daughter speaking lashon hara, it is a mitzvah to rebuke them and to stop them, as it is written (Mishlei 22:6): "Guide the youth according to his bent, etc.", as it is explained in Orach Chaim 343:1, in connection with all the issurim in the Torah.