Gṛhyasūtras
Gṛhyasūtra (गृह्यसूत्र):—A category of late Vedic texts, classified as belonging to the Kalpasūtra literature of the Vedāṅga (and therefore as smṛti), which deals with the proper performance of the domestic rituals (gṛhya-yajñas), as well as containing details of various rites of passage (saṃskāras)—such as Vedic initiation (upanayana), marriage, and death—and descriptions of day-to-day religious concerns from the perspective of the householder (gṛhastha). The Gṛhyasūtras' content overlaps to some extent with that of the Dharmasūtras.
In Buddhism
General definition (in Buddhism)
[«previous (G) next»] — Grihyasutra in Buddhism glossary
Source: Google Books: Cross-Disciplinary Perspectives on a Contested Buddhist Site
The Gṛhyasūtras mark a significant moment in the history of ancestor worship in India; they codify the domestic ritual tradition that is alluded to in the older ritual literature, but finds no formal expression.