[The following is quoted from the] Midrash Rabbah, Parshas Korach (Bamidbar Rabbah: 18; 4): “Rabbi Berechiah said, ‘So harsh is strife, for the Heavenly Court does not punish [for sins, unless one is] twenty years old and over, and the Earthly court [punishes for sins committed] from thirteen years and up, [however], in the quarrel of Korach, babies [that were] one day old were swallowed into the lower levels of gehinnom, as it says, “…and their wives, and their children, and their babies.” (Bamidbar: 16; 27), “…and they and all that belongs to them descended alive into sh’ole…” (Bamidbar: 16; 33)
 Note found in the Hebrew “Kol HaLashon” printing of sefer “Shmiras HaLashon”: See the beginning of chapter 20 in Eliyahu Rabbah, where it is explained that the explanation of the pasuk “on the lives of your sucklings”, means nursing babies. [A teaching related to] this pasuk is also brought in the beginning of chapter 21. Subsequently, the statement that “one should not see his father and his mother speaking excess…”, is brought. Rabbeinu derives that this is also in the category of something that is disgusting, for which nursing babies die as a result, see over there and you will expound and find that it is easy [to understand].
 The teaching from Tanna D’Vei Eliyahu is as follows: “Another explanation: “…Raise your palms to Him, for the life of your sucklings who are enwrapped in famine by the entrance of all districts.” (Eichah: 2; 19) [Based on this verse, our Sages] said, ‘A person should beseech [HaShem] for mercy upon himself and upon his wife and upon his children, as well as [for] the people of his household, so that none of them shall come to [perform] that which is reprehensible. [In addition], a person should not remain silent [if] he sees his father and his mother when they are speaking words of excess. If one acted this way [by refraining from silencing his mother and father when they speak words of excess], “he and they will not complete their days and their years, as it says, “Only guard yourself and guard your soul greatly…”” (Divarim: 4; 9)
The commentary Shai LaMora explains the following on the above passage from Eliyahu Rabba:
“Words of excess” refer to forbidden types of speech, such as Lashon HaRa. If one speaks words of excess, they fall into gehinnom. Rabbi Nachman bar Yitzchak says that even one who is silent and does not stop such speech, falls into gehinnom. (Shabbos, 33a)
 The entire pasuk states, “The sons gather the wood and the fathers burn the fire and the wives knead the dough, [in order] to make cookies for the “queen of Heaven” and to offer libations to other gods, in order to anger Me.” (Yirmiyahu: 7; 18) This pasuk comes to teach how the entire family would play a part in the sin of idolatry in order to “anger” G-d. So too, in our context, when members of the family join together to involve themselves in a quarrel, they all join together to go against HaShem and bring great punishment to themselves, chas v’shalom.