The Death ceremonies conducted for the first twelve Days in Hinduism, more specifically in the case of Brahmins,relate to these aspects. Once the life leaves the body it becomes Sava,without Auspiciosness,Shiva. The human body has two aspects,Sthula,Gross and Sookshma,Subtle.
Customs and languages,though they may change, never lose their identity if one were to dig deep. The customs of Hindus are ,in some ways, unique and they transcend regions. Hindus have two ways of dead bodies. Burning and Burial.
What I am certain is that these deaths bring in Pitru Dosha and Pariharas are necessary. The Days inauspicious for Death fall under three categories. Relating to the Nakshatras, Stars. Rohini, Dhanishta, Satabhisham, Purvabhadra, Revathi, Mrugasira, Punarvasu, Uttara, Chitra, Visakha, Uttarashada, and Magha. Thithis, Waxing and Waning of the Moon. Padyami, Vidiya, Shashti, Ashtami, Ekadasi, Dwadasi, Trayodasi, Chaturdasi and Amavasya.
Twelfth Day, Sapindikarana. On the eleventh and Twelfth-day the Preta eats the food offered heartily. On the eleventh and twelfth day all the Pitrus are present. Vasu,Father; Rudram, Grand father nd great grand father,Adhitya.(Paternal) The earliest Pitru leaves the Pitru Loka and leaves for the Swarga and the presently decesed joins the Pitrus as the Vasu.
The dying is made to lie down head facing South. The body without Life is called Sava while the state of Jiva(Soul) is Preta. The Yamadutas, the servants of the Lord of Death, Yama drags the life out. As soon as the life is out, a small oil lamp lit with Gingelly oil is left near the body's head. The body is to be laid on the Dharpa grass. The body is bathed, daughters, perform this and draped with a new Cloth after removing everything else from the body. The body is garlanded and Rice is dropped in the mouth by the relatives. The ceremonies are performed as dictated int the relevant Veda Sutra of the deceased. The son takes bath and performs the Homa and takes the body with Fire in a pot to the cremation Ground. The son is expected to shave, in some custom hair of the head is also removed. At the cremation ground, the son performs Nagna Prachchadana Sraddham,after removing the clothes from the body.