The Prophet (ﷺ) sought salvation for Hasan-Hussein (grandchildren) in this way:
أُعِيْذُكُمَا بِكَلِمَاتِ اللَّهِ التَّامَّةِ مِنْ كُلِّ شَيْطَانٍ وَّهَامَّةٍ وَّمِنْ كُلِّ عَيْنٍ لَامَّةٍ
Pronunciation
U'eethukumaa bikalimaatil-laahit-taammati min kulli shaytaanin wa haammah, wa min kulli 'aynin laammah
Meaning
I seek protection for you in the Perfect Words of Allah from every devil and every beast, and from every envious blameworthy eye.
Source: Bukhari: 3371
Read the hadith
حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنِ الْمِنْهَالِ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم يُعَوِّذُ الْحَسَنَ وَالْحُسَيْنَ وَيَقُولُ " إِنَّ أَبَاكُمَا كَانَ يُعَوِّذُ بِهَا إِسْمَاعِيلَ وَإِسْحَاقَ، أَعُوذُ بِكَلِمَاتِ اللَّهِ التَّامَّةِ مِنْ كُلِّ شَيْطَانٍ وَهَامَّةٍ، وَمِنْ كُلِّ عَيْنٍ لاَمَّةٍ " .
Narrated Ibn `Abbas: The Prophet (ﷺ) used to seek Refuge with Allah for Al-Hasan and Al-Husain and say: "Your forefather (i.e. Abraham) used to seek Refuge with Allah for Ishmael and Isaac by reciting the following: 'O Allah! I seek Refuge with Your Perfect Words from every devil and from poisonous pests and from every evil, harmful, envious eye.' " [Bukhari: 3371]
Duas from IslamicAPI's Masnun Dua dataset (based on the Quran, hadith, Hisnul Muslim and Rahe Belayat). See the dataset