Garudapurana 1.6.31

1.6.31

āpasya putro vetuṇḍiḥ (ṇḍaḥ) śramaḥ śrānto dhvanistathā /
dhruvasya putro bhagavānkālo lokaprakālanaḥ //

The sons of Āpa were Vetuṇḍa, Śrama, Śrānta, and Dhvani; / the son of Dhruva was the divine Kāla, the consumer of the worlds;