Defending the honor of a parent- Protesting someone who defames one’s parent and defending their honor:[1]

It is a mitzvah on one who hears a person defaming his parent to protest against him, and to defend his parents from the libel telling the person that he is stating a lie about his parent.[2] A child does not have the right to forgive his parents honor in these matters.[3] Nonetheless, he is not to hit the person who defamed his parent.[4] Likewise, he should answer him appropriately and honestly and not make up a libel in return.[5] Furthermore, if one knows that by protesting the defamation it’ll cause it to be spread even more, then it is permitted for him to remain quiet.[6]

Not to act in a way that will cause people to curse one’s parents:[7] Included within the mitzvah to honor one’s parents, is to abstain from behaviors that will ignite people to belittle one’s parents.

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[1] Pesakim Uteshuvos 240:24; Encyclopedia Talmudit Erech Kibud Av Vaeim Vol. 26 p. 390-391

[2] Sefer Hayirah of Rabbeinu Yona 197; Sefer Chassidim 72; See Orchos Chaim of Rosh 82

[3] Yam Shel Shlomo Bava Kama 8:50; Shut Maharshal 101; Shiyurei Kneses Hagedola Y.D. 240:5; See Bereishis 50:25; Sotah 13b; Encyclopedia Talmudit Erech Kibud Av Vaeim Vol. 26 p. 390

[4] Sefer Hayirah ibid; Orchos Chaim ibid

[5] Sefer Chassidim ibid

[6] Sefer Hayirah ibid; See Minchas Elazar 4:13

[7] Sefer Chareidim 66:77