Aupasana
Aupasana is a
Hindus who have been initiated during marriage
.
shraaddha
, must be conducted in the aupasana fire. The son lights his aupasana fire during his marriage from his father's aupasana fire. The son's fire, like his father's, must be maintained throughout his life. Thus, without any break, the sacred fire is kept burning in the family generation after generation.
All rites in which the aupasana fire is used and pertain to an individual and his family are "Grhyakarmas". The seven pakayajnas also belong to this category. They are related exclusively to the family and are not very elaborate. Even so, they are conducive to the good of the world outside also.
Smritis
and are called "Smarta-karmas".