Halakha Amsal 3:9: Mishneh Torah, Rebels, Chayyei Adam, Sefer Chasidim & Kitzur Shulchan Arukh

A mamzer is obligated to honor his father even though he is exempt from [the prohibitions regarding] striking him or cursing him. Even if his father were a wicked sinner, he would honor and revere him. If he sees his father transgress a Torah law, he does not say to him "Father, you transgressed this Torah law!" Rather, he says to him, "Father, is it written in the Torah that such-and-such...?" as if to ask him and not to reproach him.

In action, how is one obligated to honor them? With his body and with his wealth: to feed them, give them drink, clothe them, and attend to all their needs. As it states in the Mekhilta: "Honor your father" — I might think with words alone. Therefore it says, "Honor the Lord with your wealth" (Proverbs 3:9), thus equating their honor with the honor of the Omnipresent. Now we can conclude: feed them, give them drink, clothe them, bring them in and take them out. And whatever one gives them should be done with a cheerful countenance. For even if one feeds them fattened fowl every day but shows them a grim face, he is punished for it. And conversely, even if one makes them grind at a mill, yet his intention is for their benefit — to save his parents from something harder than this — and he speaks words of appeasement to their hearts, showing them that his intention is for their good and that he cannot provide for them in any other way, until they are appeased to grind, he inherits the World to Come. And one is obligated to serve them as a servant serves his master. (See Kiddushin 31b in Tosafot s.v. "Kabed" and s.v. "VeTordo")

“Honor the Lord with thy substance” (Prov. 3:9). You buy a box to safeguard your silver and gold, better that you buy a lovely box to safekeep your books and phylacteries. “Honor the Lord with thy substance,” from that which He provides for your pleasure.¹Rashi, Proverbs 3:9. If you possess a sweet voice it is meritorious to lead in prayer. “This is my God and I will glorify Him” (Exod. 15:2). Make yourself pleasing to Him with deeds i.e., a beautiful citron (ethrog), a beautiful palm branch, a beautiful booth, a beautiful prayer shawl,²Shabbath 133b. and so shall you do for all of God’s requirements.