I am a Hindu but sometimes I really think what is going on in our religion. Someone lost his family member and gave bhoz (party) to all the relatives and brahmins. Why is this happening in Hindu culture only?
According to Garuda Purana, it is said that when death occurs, the subtle body of a person leaves the gross body. Subtle body and his soul comes out and can see the servants of Yama and attendants of Lord Vishnu who are present there to take that person to Yuma Loka.
That Subtle body is almost the size of one's thumb. After death rituals get started at that time. The person should be cremated within 12 hours after death. And from the next day the ritual of Pinda Daan also gets started.
Lord Vishnu explains Pindas in "Garuda Purana". In the southern part of house, a pit is made and pindas are offered daily for ten days. These help to make a new body for the dead. On the tenth day the subtle body develops hunger. The subtle body itself is called as Preta. On Thirteenth day, the subtle body(Preta) starts its journey to Yumloka. So preta eats as much on this day. Family Offers a bhoj to the departed soul.