The works of Ādi Śaṅkarācārya

Sanatsujātīyam

p. 279

p. 279

तत्पुत्रे च तथा कुर्वन्द्वितीयः पाद उच्यते ॥

In plain words

And serving his son in the same spirit—this is declared to be the second quarter.

Close to the Sanskrit

And acting likewise toward his son, the second quarter is spoken of.