Vishnupurana 3.13.4

3.13.4

nāndīmukhaḥ pitṛgaṇas tena śrāddhena pārthiva
prīyate tat tu kartavyaṃ puruṣaiḥ sarvavṛddhiṣu //

AURVA continued.--"The bathing of a father without disrobing is enjoined when a son is born; and he is to celebrate the ceremony proper for the event, which is the Śráddha offered upon joyous occasions. With composed mind, and thinking on nothing else, the Brahman should offer worship to both the gods and progenitors, and should respectfully circumambulate, keeping Brahmans on his left hand, and give them food. Standing with his face to the east, he should present, with the parts of the hand sacred to the gods and to Prajápati, balls of food, with curds, unbruised grain, and jujubes; and should perform, on every accession of good fortune, the rite by which the class of progenitors termed Nándímukha is propitiated. A householder should diligently worship the Pitris so named, at the marriage of a son or daughter, on entering a new dwelling, on giving a name to a child, on performing his tonsure and other purificatory ceremonies, at the binding of the mother's hair during gestation, or on first seeing the face of a son, or the like. The Śráddha on such occasions, however, has been briefly alluded to. Hear now, oh king, the rules for the performance of obsequial rites.