Some examples of being dutiful to Parents

Saad bin Abi Waqas (رضى الله عنه) had accepted Islam as a young boy; this disturbed and saddened his mother very deeply because he had given up the faith of his father and forefathers. She tried in many ways to bring him back into the fold of Kufr. When nothing worked she used the last resort of mothers to emotionally blackmail her obedient and loving son. This is something, which makes their determination falter and their resolutions fail. She went on a hunger strike and declared she would not eat until her son came back to the religion of his forefathers. She vowed that rather die than see her son become a Muslim..

Saad bin Abi Waqas (رضى الله عنه) was unnerved when he saw her stubbornness, but pure faith had taken strong roots in his heart, so his strong feet firmly planted in Islam did not totter or shaken. His mother was close to death by starvation and thirst. Displaying strong determination and courage he said to her:
Mother, if you had a hundred lives within you body, and each one of those hundred lives were to leave your body in front of my eyes, even then I would not recant and give up my faith in Islam. It is your wish whether you want to eat or not; as to myself I will not leave my Prophet (صلى الله عليه وسلم)
 
Seeing that it was of no use and her son was determined, she finished her hunger strike. This resolution and determination of Saad bin Abi Waqas (رضى الله عنه) had been made immortal.

قال الله تعالى فى سُوۡرَةُ لقمَان

وَإِن جَـٰهَدَاكَ عَلَىٰٓ أَن تُشۡرِكَ بِى مَا لَيۡسَ لَكَ بِهِۦ عِلۡمٌ۬ فَلَا تُطِعۡهُمَا‌ۖ وَصَاحِبۡهُمَا فِى ٱلدُّنۡيَا مَعۡرُوفً۬ا‌ۖ وَٱتَّبِعۡ سَبِيلَ مَنۡ أَنَابَ إِلَىَّ‌ۚ ثُمَّ إِلَىَّ مَرۡجِعُكُمۡ فَأُنَبِّئُڪُم بِمَا كُنتُمۡ تَعۡمَلُونَ (15

But if they strive with thee to make thee ascribe unto Me as partner that of which thou hast no knowledge, then obey them not. Consort with them in the world kindly, and follow the path of him who repenteth unto Me. Then unto Me will be your return, and I shall tell you what ye used to do - (15)