असक्ितरनभिष्वङ्गः पुत्रदारगृहादिषु। नित्यं च समचित्तत्वमिष्टानिष्टोपपत्तिषु ॥

asaktir anabhiṣhvaṅgaḥ putra-dāra-gṛihādiṣhu nityaṁ cha sama-chittatvam iṣhṭāniṣhṭopapattiṣhu

Unattachment, absence of self-identification with son, wife or home, and constant balance of mind in wished-for and unwished-for events,

In plain words: Krishna adds that wisdom means not clinging, and not tying your whole identity to your children, spouse or home. It means staying calm whether what happens is wanted or unwanted.