Halakhah for Kiddushin 61:8

From the laws of the commandment is that which they, may their memory be blessed, said (Kiddushin 31a). "To what point is the reverence of father and mother? That even if they strike him and they spit in his face, he does not embarrass them." And even so, the sages commanded (Moed Katan 17a) a person not to strike his adult son, since there is in the thing [a possible violation of], "do not put a stumbling block in front of the blind" (Sefer HaChinukh 232) - (lest he kick his father, and it will be he that made him stumble - Rashi there). And we excommunicate someone for that. And they, may their memory be blessed, said (Kiddushin 31b) about the stringency of this commandment that even if the father or mother lose their mind, the son must make efforts to behave in a way of honor towards them, according to their perception. But if they become extremely insane, he is able to leave them and command others over them to treat them as is fit, if he has [this possibility]. And a mamzer is obligated in the honor of parents and their reverence (Yevamot 22b), even though they are exempted from the statute of hitting them or cursing them. And they, may their memory be blessed, taught us about this matter (Bava Metzia 32a) that if the parents command to transgress words of Torah - and even a rabbinic commandment - we do not listen to them. [These] and the rest of its details are in [sacttered] places in the Gemara, but the most are in Kiddushin, according to my opinion (see Tur, Yoreh Deah 240).