The Law Code of Devala 6.8: Nirṇayasindhu · Śrāddhamañjarī (Bāpūbhaṭṭa Kelakāra) · Śrāddhacandrikā (Divākarabhaṭṭa)

6.8

ekenāpi hi vipreṇa ṣaṭpiṇḍaṃ śrāddham ācaret | ṣaḍ arghyān dāpayet tatra ṣaḍbhyo dadyāt tathā haviḥ

At a death or a birth, for female slaves, / and for wives taken in natural order of castes, / purification is equal to that of the master; when the master dies, it is by uterine kinship.

Even with a single Brahmin one should perform the śrāddha of six rice-balls; he should have six guest-offerings given there, and likewise give the oblation to the six.