One verse

Srimad Bhagavatam 7.5.36

7.5.36

विष्णोर्वा साध्वसौ किं नु करिष्यत्यसमञ्जस: । सौहृदं दुस्त्यजं पित्रोरहाद्य: पञ्चहायन: ॥ ३६ ॥

visnor va sadhv asau kim nu karisyaty asamanjasah sauhrdam dustyajam pitror ahad yah panca-hayanah

visnoh
unto Visnu
va
either
sadhu
good
asau
this
kim
whether
nu
indeed
karisyati
will do
asamanjasah
not trustworthy
sauhrdam
affectionate relationship
dustyajam
difficult to relinquish
pitroh
of his father and mother
ahat
gave up
yah
he who
panca-hayanah
only five years old.

Although Prahlada 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 Visnu.