Kshatriyas should kill fathers and grandfathers and brothers and preceptors and relatives and kinsmen that may give them an unjust battle. This is their open duty.
पितॄन् पितामहान् भ्रातृन् गुरून् सम्बन्धिबान्धवान्। मिथ्याप्रवृत्तान् यः संख्ये निहन्याद् धर्म एव सः॥