Arjuna explicitly lists the people he is refusing to kill. It is a comprehensive inventory of his social and biological world. He names the teachers (Drona, Kripa), fathers/uncles (Shalya, Shakuni), grandfathers (Bhishma, Somadatta), and extends down to sons, grandsons, and in-laws. This verse emphasizes the sheer scale of the civil war—there is virtually no degree of separation between the two armies.