During normal amavasai tharpanam you have to do tharpanam for father, grand father, great grand father and mother, your father"s mother and great grand mother and mother"s father, grandfather and great grand father and their wives. In addition to this during mahalayam you have to do only for the deceased persons your father"s brother, sister, Your mother"s brother, sister, and your son. daughter, daughter in law. wife. friends, guru, your sister , your brother, your sister"s husband, your father-in-law.
