Matsyapurana 16.54

16.54

ādhatta pitaro garbham atra saṃtānavardhanam
tāvaduccheṣaṇaṃ tiṣṭhed yāvadviprā visarjitāḥ //

The ball of rice in the middle should be given to the wife of the host (this is the peculiarity in this Śrâddha). It begets progeny. She should eat the ball of rice after pronouncing the following words: "Âdhatta pitaro garbhamatra santâna vardhanam" (Piṭris grant to me progeny that would continue the line of the house). The host should remain standing till the Brâhmaṇas depart. He should then perform the remaining rites.—54.