Bhagavad Gita: Chapter 1, Verse 42-43

सङ्करो नरकायैव कुलघ्न‍ानां कुलस्य च ।
पतन्ति पितरो ह्येषां लुप्तपिण्डोदकक्रियाः ॥ १-४२ ॥

saṅkaro narakāyaiva kula-ghnānāṁ kulasya cha
patanti pitaro hy eṣāṁ lupta-piṇḍodaka-kriyāḥ 1.42

An increase in unwanted children results in hellish life both for the family and for those who destroy the family. The ancestors of such corrupt families fall down because the performances for offering them food and water are entirely stopped.

दोषैरेतैः कुलघ्न‍ानां वर्णसङ्करकारकैः ।
उत्साद्यन्ते जातिधर्माः कुलधर्माश्च शाश्वताः ॥ १-४३ ॥

doṣair etaiḥ kula-ghnānāṁ varṇa-saṅkara-kārakaiḥ
utsādyante jāti-dharmāḥ kula-dharmāś cha śāśvatāḥ 1.43

By the evil deeds of those who destroy the family tradition and thus give rise to unwanted progeny, all kinds of social projects and family welfare activities are ruined.