Du'a to direct a father's heart

اللَّهُمَّ مُصَرِّفَ الْقُلُوبِ صَرِّفْ قَلْبَهُ عَلَى طَاعَتِكَ

Allahumma Musarrifal-qulub, sarrif qalbahu 'ala ta'atik

O Allah, Turner of the hearts, direct his heart to Your obedience.

Adapted into the third person masculine from Ṣaḥīḥ Muslim 2654.