|Chapter 1: Observing the Armies on the Battlefield of Kurukshetra|
tatrapasyat sthitan parthah
pitrin atha pitamahan
acaryan matulan bhratrin
putran pautran sakhims tatha
svasuran suhridas caiva
senayor ubhayor api
There Arjuna could see, within the midst of the armies of both parties, his fathers, grandfathers, teachers, maternal uncles, brothers, sons, grandsons, friends, and also his fathers-in-law and well-wishers.
The plurals applied to father, sons etc. is based on the Vedic conception of an extended family where in a father's brother is considered non-different from the father and a brother's son just as one's own son. Arjuna saw many people who he related to as father, son, friend or brother and they were all assembled their to fight him. Arjuna saw Bhurisvara a contemporary of his father. Somdatta and Bhisma were like his grandfather, teachers like Drona and Kripa, uncles like Salya and Sakuni, brothers like Duryodhana, sons like Lakshmana (the son of Duryodhana), friends like Ashvattama and well wishers like Krtavarma.
Please read the Sanskrit Verse and the Prabhupada's Purport.