O Allah, prolong my parents' lives in Your obedience and make their last words ' — Parents
اللَّهُمَّ أَطِلْ عُمْرَ وَالِدَيَّ فِي طَاعَتِكَ وَاجْعَلْ آخِرَ كَلَامِهِمَا لَا إِلَهَ إِلَّا اللَّهُ
Transliteration: Allaahumma atil 'umra waalidayya fee taa'atika waj'al aakhira kalaamihimaa laa ilaaha illallaah
Translation: O Allah, prolong my parents' lives in Your obedience and make their last words 'there is no god but Allah'.
Reference: General supplication