One of the greatest worship in Islam after menthidising God is to serve the parents. ALLAH SWT said. "And we command the people (do good) to his two fathers, his mother has conceived him in a state of increasing weakness, and wean him in two years, thank me and to your two mothers, only to me your return "(QS Luqman, 31:14)
Remember that, ridholloohi fii ridhol walidaini, wa sakhotullohi fii sakhotil waalidaini. The pleasure of Allah is in the pleasure of both parents, and the wrath of God is upon the wrath of the parents. (HR Tirmidhi)
Allah the Most Wise has obliged every child to worship his parents. Even the command to do good to the parents in the Qur'an is coupled with the command to bertauhid as his word, "And your Lord has commanded that you should not worship other than Him and be good to your father's mother as well as possible. If one of the two or both is to remain old in your care, then never say to them both the words 'ah' and do not yell at them and say to them noble words. And humble yourselves to both of them with your beloved and say: 'O my Lord, love them both, as they both have taught me as a child.' "(Qs.Al Isro ': 23)
In the hadith of Abi Bakrah, Rosullah SAW said: "Will you tell me the greatest sin?" The Companions replied, "Sure." The Prophet said, "(That is) doing shirk, duraka to both parents" (HR. Al Bukhori)
Wallahu'alam ...