Causing hurt to parents is a major sin

'Imran ibn Husayn said, "The Messenger of Allah, may Allah bless him and grant him peace, said, 'What do you say about fornication, drinking wine and theft?' 'Allah and His Messenger know best,' we replied. He stated, 'They are acts of outrage and there is punishment for them, but shall I tell you which is the greatest of the great wrong actions? Associating with Allah Almighty and disobeying parents.' He had been reclining, but then he sat up and said, 'and lying.'"  

قَالَ رَسُولُ اللهِ ﷺ مَا تَقُولُونَ فِي الزِّنَا وَشُرْبِ الْخَمْرِ وَالسَّرِقَةِ؟ قُلْنَا اللَّهُ وَرَسُولُهُ أَعْلَمُ قَالَ هُنَّ الْفَوَاحِشُ وَفِيهِنَّ الْعُقُوبَةُ أَلاَ أُنَبِّئُكُمْ بِأَكْبَرِ الْكَبَائِرِ؟ الشِّرْكُ بِاللَّهِ عَزَّ وَجَلَّ وَعُقُوقُ الْوَالِدَيْنِ وَكَانَ مُتَّكِئًا فَاحْتَفَزَ قَالَ وَالزُّورُ