Bhrigusmriti 1.5: Madanapārijāta · Nirṇayasindhu · Śrāddhacandrikā (Divākarabhaṭṭa) +2

1.5

ekakāle gatāsūnāṃ bahūnām athavā dvayoḥ | tantreṇa śrapaṇaṃ kṛtvā kuryāc chrāddhaṃ pṛthak pṛthak

For many, or even for two, who have died at the same time, / having performed the cooking in a single procedure, one should perform the śrāddha separately [for each].

When many, or two, have died at the same time, one should cook (the food) together and perform the śrāddha for each separately.