1.Because it’s a religious practice based on the belief that one's ancestors process supernatural powers, such as gods, angels, saints, or demons. 2.The activities of the worship : visit the ancestors at their graves, make offerings to them to provide for their welfare in the afterlife 3. People burn spirit money for their dead ancestors as an offering to ancestors as well for the afterlife. 4. On the outer surface of the spirit tablet is engraved the year of the death, his full name, and the name of the son who erects the tablet. 5. Anniversary rites take place the death date of each major deceased member of the family every year