Du'a for children's love of Allah

اللَّهُمَّ ارْزُقْهُمْ حُبَّكَ، وَحُبَّ نَبِيِّكَ مُحَمَّدٍ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ، وَحُبَّ كُلِّ مَنْ يُحِبُّكَ، وَحُبَّ عَمَلٍ يُقَرِّبُهُمْ إِلَى حُبِّكَ

Allahummar-zuqhum hubbak, wa hubba nabiyyika Muhammadin sallallahu 'alayhi wa sallam, wa hubba kulli man yuhibbuk, wa hubba 'amalin yuqarribuhum ila hubbik

O Allah, grant them Your love, the love of Your Prophet Muhammad (peace be upon him), the love of everyone who loves You, and the love of deeds that bring them closer to Your love.

Adapted into the plural for children from Sunan al-Tirmidhī 3490.