Although Prahlāda is only five years old, even at this young age he has given up his affectionate relationship with his father and mother. Therefore, he is certainly untrustworthy. Indeed, it is not at all believable that he will behave well toward Viṣṇu.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
विष्णोर्वा साध्वसौ किं नु करिष्यत्यसमञ्जसः । सौहृदं दुस्त्यजं पित्रोरहाद्यः पञ्चहायनः
viṣṇorvā sādhvasau kiṃ nu kariṣyatyasamañjasaḥ | sauhṛdaṃ dustyajaṃ pitrorahādyaḥ pañcahāyanaḥ
SB 7.5.36