Musar על סנהדרין 103:3

I also implore and plead with you to guide your daughters very carefully to refrain from cursing, swearing, lying and fighting. Rather, everything they do should be done peacefully, with love, affection and gentleness. I have left behind several Yiddish books on Mussar (morality). See that [the children] read them constantly, especially on the Holy Shabbos, when Mussar is the only thing they should read. Always instruct them according to Mussar books. Don't hold back from hitting them when they curse, swear or lie. Don't be lenient with them, because parents will be punished severely for the corruption of their children, G-d forbid. And even if one constantly teaches them Mussar, but they do not follow it, one's sorrow and shame in the World-to-Come will be great. As it is written (Vayikra 21:9), "She defiles her father" - [in such a case] the son of a righteous man is called "the son of a wicked man" (Sanhedrin 52a). Similarly, in other matters, lashon hara and gossip. Their eating and drinking should always be preceded and followed by the appropriate blessings. They must be careful to say the blessings, Birkas Hamazon and Krias Shema with proper kavanah (intent). Most importantly, they must not wander outside the home and must obey and respect you and my mother and all their elders. They also need to observe all that is written in the Mussar books.