एकेन शुष्कवृक्षेण दह्यमानेन वह्निना ।
दह्यते तद्वनं सर्वं कुपुत्रेण कुलं यथा ॥३.१५॥

ekena śuṣkavṛkṣeṇa dahyamānena vahninā |
dahyate tadvanaṃ sarvaṃ kuputreṇa kulaṃ yathā ||3.15||

a single dry tree burning with fire, burns the forest entirely; a bad son to his family does likewise

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Excerpt from the book “Old Chanakya Strategy: Aphorisms” by Rajen Jani