Bhagavad Gita 1.34
आचार्याः पितरः पुत्रास्तथैव च पितामहाः। मातुलाः श्वशुराः पौत्राः श्यालाः सम्बन्धिनस्तथा।।1.34।।
ācāryāḥ pitaraḥ putrāstathaiva ca pitāmahāḥ| mātulāḥ śvaśurāḥ pautrāḥ śyālāḥ sambandhinastathā||1.34||
acaryah pitarah putrastathaiva ca pitamahah matulah shvashurah pautrah shyalah sambandhinastatha1.34
Meaning
Teachers, fathers, sons, grandfathers, uncles, fathers-in-law, grandsons, brothers-in-law, and other relatives — all stand arrayed for battle.
आचार्य, पिता, पुत्र, पितामह, मामा, ससुर, पौत्र, साले और अन्य सम्बन्धी — ये सभी युद्ध में खड़े हैं।
This is verse 34 of 47 in Chapter 1 (Arjuna Vishada Yoga) of the Bhagavad Gita.