The annual Tomb-sweeping day has been a tradition for a long time,people will go back to their home town no matter were they are at,because of Chiese cultures great influence,people believe that if the spirts of their ancestors are happy and peacful in heaven,they will protect and give influence to their descendant like,wealth,health and a happy family,so a really basic way of making your ancestors happy is to clean their tomb,burn some money to them and remember them.