Pūṣā had no sons. When Lord Śiva was angry at Dakṣa, Pūṣā had laughed at Lord Śiva and shown his teeth. Therefore he lost his teeth and had to live by eating only ground flour.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
पूषानपत्यः पिष्टादो भग्नदन्तोऽभवत्पुरा । योऽसौ दक्षाय कुपितं जहास विवृतद्विजः
pūṣānapatyaḥ piṣṭādo bhagnadanto'bhavatpurā | yo'sau dakṣāya kupitaṃ jahāsa vivṛtadvijaḥ
SB 6.6.43