Du'a for children's independence from the unlawful

اللَّهُمَّ اكْفِهِمْ بِحَلَالِكَ عَنْ حَرَامِكَ، وَأَغْنِهِمْ بِفَضْلِكَ عَمَّنْ سِوَاكَ

Allahummak-fihim bihalalika 'an haramik, wa aghnihim bifadlika 'amman siwak

O Allah, suffice them with Your lawful against Your prohibited, and make them independent of all those besides You by Your bounty.

Adapted into the plural for children from Sunan al-Tirmidhī 3563.