Bhagwad Gita
Chapter 1, Verse 39
कथं न ज्ञेयमस्माभिः पापादस्मान्निवर्तितुम्।
कुलक्षयकृतं दोषं प्रपश्यद्भिर्जनार्दन।।1.39।।
With the destruction of dynasty, the eternal family tradition is vanquished, and thus the rest of the family becomes involved in irreligious practice.