Serving parents is compulsory for children
Obedience of parents is compulsory on children as long as they give orders which are correct as per the Shariah. If the parents order to go against the Shariah or to commit some wrong deed, then they will not be obeyed, as the disobedience of the Creator in obedience of the creation is not correct.
There is a Hadith on the authority of Hadhrat ‘Abdullah bin ‘Abbas (May Allah be well pleased with them):
Translation: You go before your parents as if a lowly, emaciated slave is entreating his stern and harsh master to seek his pleasure. (Tafseer Ruh Al Bayan, Surah Isra-23)